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  • 801. Aad, G
    et al.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ishino, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Madsen, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Search for nonpointing photons in the diphoton and E-T(miss) final state in root s=7 TeV proton-proton collisions using the ATLAS detector2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 1, p. 012001-Article in journal (Refereed)
    Abstract [en]

    A search has been performed for photons originating in the decay of a neutral long-lived particle, exploiting the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction of photons, as well as the calorimeter's excellent time resolution. The search has been made in the diphoton plus missing transverse energy final state, using the full data sample of 4.8 fb(-1) of 7 TeV proton-proton collisions collected in 2011 with the ATLAS detector at the LHC. No excess is observed above the background expected from Standard Model processes. The results are used to set exclusion limits in the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying with a lifetime in excess of 0.25 ns into a photon and a gravitino.

  • 802. Aad, G.
    et al.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Costa, Marcio Jorge Teles da
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Search for anomalous production of prompt like-sign lepton pairs at root s=7 TeV with the ATLAS detector2012In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 12, p. 007-Article in journal (Refereed)
    Abstract [en]

    An inclusive search for anomalous production of two prompt, isolated leptons with the same electric charge is presented. The search is performed in a data sample corresponding to 4.7 fb(-1) of integrated luminosity collected in 2011 at root s = 7TeV with the ATLAS detector at the LHC. Pairs of leptons (e(+/-)e(+/-), e(+/-)mu(+/-), and mu(+/-)mu(+/-)) with large transverse momentum are selected, and the dilepton invariant mass distribution is examined for any deviation from the Standard Model expectation. No excess is found, and upper limits on the production cross section of like-sign lepton pairs from physics processes beyond the Standard Model are placed as a function of the dilepton invariant mass within a fiducial region close to the experimental selection criteria. The 95% confidence level upper limits on the cross section of anomalous e(+/-)e(+/-), e(+/-)mu(+/-), or mu(+/-)mu(+/-) production range between 1.7 fb and 64 fb depending on the dilepton mass and flavour combination.

  • 803. Aad, G.
    et al.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of three-jet production cross-sections in pp collisions at 7 TeV centre-of-mass energy using the ATLAS detector2015In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 5, article id 228Article in journal (Refereed)
    Abstract [en]

    Double-differential three-jet production cross-sections are measured in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV using the ATLAS detector at the large hadron collider. The measurements are presented as a function of the three-jet mass (m(jjj)), in bins of the sum of the absolute rapidity separations between the three leading jets (|Y*|). Invariant masses extending up to 5 TeV are reached for 8 < |Y*| < 10. These measurements use a sample of data recorded using the ATLAS detector in 2011, which corresponds to an integrated luminosity of 4.51 fb(-1). Jets are identified using the anti-k(t) algorithm with two different jet radius parameters, R = 0.4 and R = 0.6. The dominant uncertainty in these measurements comes from the jet energy scale. Next-to-leading-order QCD calculations corrected to account for non-perturbative effects are compared to the measurements. Good agreement is found between the data and the theoretical predictions based on most of the available sets of parton distribution functions, over the full kinematic range, covering almost seven orders of magnitude in the measured cross-section values.

  • 804. Aad, G.
    et al.
    Buszello, C.P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector2013In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 11, p. 112003-Article in journal (Refereed)
    Abstract [en]

    An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22.9 fb(-1) of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty bunch crossings of the LHC in order to remove pp collision backgrounds. Selections based on jet shape and muon system activity are applied to discriminate signal events from cosmic ray and beam-halo muon backgrounds. In the absence of an excess of events, improved limits are set on gluino, stop, and sbottom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass below 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime between 10 mu s and 1000 s in the generic R-hadron model with equal branching ratios for decays to q (q) over bar(chi) over tilde (0) and g (chi) over tilde (0). Under the same assumptions for the neutralino mass and squark lifetime, top squarks and bottom squarks in the Regge R-hadron model are excluded with masses below 379 and 344 GeV, respectively.

  • 805. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C. J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ikegami, Y.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zwalinski, L.
    Search for massive long-lived highly ionising particles with the ATLAS detector at the LHC2011In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 698, no 5, p. 353-370Article in journal (Refereed)
    Abstract [en]

    A search is made for massive highly ionising particles with lifetimes in excess of 100 ns, with the ATLAS experiment at the Large Hadron Collider, using 3.1 pb(-1) of pp collision data taken at root s = 7 TeV. The signature of energy loss in the ATLAS inner detector and electromagnetic calorimeter is used. No such particles are found and limits on the production cross section for electric charges 6e <= vertical bar q vertical bar <= 17e and masses 200 GeV <= m <= 1000 GeV are set in the range 1-12 pb for different hypotheses on the production mechanism.

  • 806. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C. J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zwalinski, L.
    Measurement of underlying event characteristics using charged particles in pp collisions at root s = 900 GeV and 7 TeV with the ATLAS detector2011In: Physical Review D - Particles, Fields, Gravitation and Cosmology, ISSN 1550-7998, Vol. 83, no 11, p. 112001-Article in journal (Refereed)
    Abstract [en]

    Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event'' is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest transverse momentum charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to the underlying event. In each of these regions, distributions of the charged particle multiplicity, transverse momentum density, and average p(T) are measured. The data show generally higher underlying event activity than that predicted by Monte Carlo models tuned to pre-LHC data.

  • 807. Aad, G
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C.J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zutshi, V.
    Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector2011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 2, p. 1512-Article in journal (Refereed)
    Abstract [en]

    Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector. The measurement uses an integrated luminosity of 17 nb(-1) recorded at the Large Hadron Collider. The anti-k(t) algorithm is used to identify jets, with two jet resolution parameters, R = 0.4 and 0.6. The dominant uncertainty comes from the jet energy scale, which is determined to within 7% for central jets above 60 GeV transverse momentum. Inclusive single-jet differential cross sections are presented as functions of jet transverse momentum and rapidity. Dijet cross sections are presented as functions of dijet mass and the angular variable chi. The results are compared to expectations based on next-to-leading-order QCD, which agree with the data, providing a validation of the theory in a new kinematic regime.

  • 808. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C.J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of Dijet Azimuthal Decorrelations in pp Collisions at root s=7 TeV2011In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 106, no 17, p. 172002-Article in journal (Refereed)
    Abstract [en]

    Azimuthal decorrelations between the two central jets with the largest transverse momenta are sensitive to the dynamics of events with multiple jets. We present a measurement of the normalized differential cross section based on the full data set ( integral Ldt = 36 pb(-1)) acquired by the ATLAS detector during the 2010 root s = 7 TeV proton-proton run of the LHC. The measured distributions include jets with transverse momenta up to 1.3 TeV, probing perturbative QCD in a high-energy regime.

  • 809. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C.J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zwalinski, L.
    Measurement of the production cross section for W-bosons in association with jets in pp collisions at root s=7 TeV with the ATLAS detector2011In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 698, no 5, p. 325-345Article in journal (Refereed)
    Abstract [en]

    This Letter reports on a first measurement of the inclusive W + jets cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W-boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections sigma (W + >= n)/sigma(W + >= n - 1) for inclusive jet multiplicities n = 1-4. The results, based on an integrated luminosity of 1.3 pb(-1), have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n <= 2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicities.

  • 810. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Flechl, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zutshi, V.
    Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons2010In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 70, no 3, p. 755-785Article in journal (Refereed)
    Abstract [en]

    The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.8% in the endcaps. This leads to an estimated contribution to the constant term of (0.29(-0.04)(+0.05))% in the barrel and (0.54(-0.04)(+0.06))% in the endcaps. The same data are used to measure the drift velocity of ionization electrons in liquid argon, which is found to be 4.61 +/- 0.07 mm/mu s at 88.5 K and 1 kV/mm.

  • 811. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Flechl, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zutshi, V.
    Readiness of the ATLAS liquid argon calorimeter for LHC collisions2010In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 70, no 3, p. 723-753Article in journal (Refereed)
    Abstract [en]

    The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along eta (averaged over phi) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.

  • 812. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Flechl, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zutshi, V.
    The ATLAS Simulation Infrastructure2010In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 70, no 3, p. 823-874Article in journal (Refereed)
    Abstract [en]

    The simulation software for the ATLAS Experiment at the Large Hadron Collider is being used for large-scale production of events on the LHC Computing Grid. This simulation requires many components, from the generators that simulate particle collisions, through packages simulating the response of the various detectors and triggers. All of these components come together under the ATLAS simulation infrastructure. In this paper, that infrastructure is discussed, including that supporting the detector description, interfacing the event generation, and combining the GEANT4 simulation of the response of the individual detectors. Also described are the tools allowing the software validation, performance testing, and the validation of the simulated output against known physics processes.

  • 813. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Coniavitis, Elias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Flechl, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Zutshia, V.
    Commissioning of the ATLAS Muon Spectrometer with cosmic rays2010In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 70, no 3, p. 875-916Article in journal (Refereed)
    Abstract [en]

    The ATLAS detector at the Large Hadron Collider has collected several hundred million cosmic ray events during 2008 and 2009. These data were used to commission the Muon Spectrometer and to study the performance of the trigger and tracking chambers, their alignment, the detector control system, the data acquisition and the analysis programs. We present the performance in the relevant parameters that determine the quality of the muon measurement. We discuss the single element efficiency, resolution and noise rates, the calibration method of the detector response and of the alignment system, the track reconstruction efficiency and the momentum measurement. The results show that the detector is close to the design performance and that the Muon Spectrometer is ready to detect muons produced in high energy proton-proton collisions.

  • 814. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C. J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the top quark-pair production cross section with ATLAS in pp collisions at root s=7 TeV2011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 3, p. 1577-Article in journal (Refereed)
    Abstract [en]

    A measurement of the production cross-section for top quark pairs (t (t) over bar) in pp collisions at root s = 7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon mu) with large missing transverse energy and at least four jets, and dilepton (ee, mu mu or e mu) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb(-1), 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-t (t) over bar Standard Model processes are estimated using data-driven methods and determined to be 12.2 +/- 3.9 events and 2.5 +/- 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM t (t) over bar production. The inclusive top quark pair production cross-section is measured to be sigma(t (t) over bar) = 145 +/- 31 (stat.)(-27)(+42) (syst.) pb. The measurement agrees with perturbative QCD calculations.

  • 815. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C. J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurements of underlying-event properties using neutral and charged particles in pp collisions at root s=900 GeV and root s=7 TeV with the ATLAS detector at the LHC2011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 5, p. 1636-Article in journal (Refereed)
    Abstract [en]

    We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV. Events were selected using a minimum-bias trigger which required a charged particle in scintillation counters on either side of the interaction point. Particle flows, sensitive to the underlying event, are measured using clusters of energy in the ATLAS calorimeters, taking advantage of their fine granularity. No Monte Carlo generator used in this analysis can accurately describe the measurements. The results are independent of those based on charged particles measured by the ATLAS tracking systems and can be used to constrain the parameters of Monte Carlo generators.

  • 816. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Search for high mass dilepton resonances in pp collisions at root s=7 TeV with the ATLAS experiment2011In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 700, no 3-4, p. 163-180Article in journal (Refereed)
    Abstract [en]

    This Letter presents a search for high mass e(+)e(-) or mu(+)mu(-) resonances in pp collisions at root s = 7 TeV at the LHC. The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated luminosity of similar to 40 pb(-1). No statistically significant excess above the Standard Model expectation is observed in the search region of dilepton invariant mass above 110 GeV. Upper limits at the 95% confidence level are set on the cross section times branching ratio of Z' resonances decaying to dielectrons and dimuons as a function of the resonance mass. A lower mass limit of 1.048 TeV on the Sequential Standard Model Z' boson is derived, as well as mass limits on Z* and E(6)-motivated Z' models.

  • 817. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C. J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Search for lepton flavour violation in the e mu continuum with the ATLAS detector in root s=7 TeV pp collisions at the LHC2012In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 72, no 6, p. 2040-Article in journal (Refereed)
    Abstract [en]

    This paper presents a search for the t-channel exchange of an R-parity violating scalar top quark ((t) over tilde) in the e(+/-)mu(-/+) continuum using 2.1 fb(-1) of data collected by the ATLAS detector in root s = 7 TeV pp collisions at the Large Hadron Collider. Data are found to be consistent with the expectation from the Standard Model backgrounds. Limits on R-parity-violating couplings at 95 % C.L. are calculated as a function of the scalar top mass (m((t) over tilde)). The upper limits on the production cross section for pp -> e mu X, through the t-channel exchange of a scalar top quark, ranges from 170 fb for m((t) over tilde) = 95 GeV to 30 fb for m((t) over tilde) = 1000 GeV.

  • 818. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hansen, C.J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the W -> lv and Z/gamma* -> ll production cross sections in proton-proton collisions at root s=7 TeV with the ATLAS detector2010In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 12, article id 060Article in journal (Refereed)
    Abstract [en]

    First measurements of the W -> lv and Z/gamma* -> ll (l = e; mu) production cross sections in proton-proton collisions at root s = 7 TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W -> lv and 179 Z/gamma* -> ll candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb(-1). The measured total W and Z/gamma*-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are sigma(tot)(W) center dot BR(W -> lv) = 9.96 +/- 0.23(stat) +/- 0.50(syst) +/- 1.10(lumi) nb and sigma(tot)(Z) center dot BR(Z/gamma* -> ll) = 0.82 +/- 0.06 (stat) +/- 0.05 (syst) +/- 0.09 (lumi) nb (within the invariant mass window 66 < m(ll) < 116 GeV). The W/Z cross-section ratio is measured to be 11.7 +/- 0.9(stat) +/- 0.4(syst). In addition, measurements of the W+ and W- production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.

  • 819. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Odaka, S.
    Inclusive search for same-sign dilepton signatures in pp collisions at root s=7 TeV with the ATLAS detector2011In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, p. 107-Article in journal (Refereed)
    Abstract [en]

    An inclusive search is presented for new physics in events with two isolated leptons (e or mu) having the same electric charge. The data are selected from events collected from p p collisions at root s = 7 TeV by the ATLAS detector and correspond to an integrated luminosity of 34 pb(-1). The spectra in dilepton invariant mass, missing transverse momentum and jet multiplicity are presented and compared to Standard Model predictions. In this event sample, no evidence is found for contributions beyond those of the Standard Model. Limits are set on the cross-section in a fiducial region for new sources of same-sign high-mass dilepton events in the ee, e mu and mu mu channels. Four models predicting same-sign dilepton signals are constrained: two descriptions of Majorana neutrinos, a cascade topology similar to supersymmetry or universal extra dimensions, and fourth generation d-type quarks. Assuming a new physics scale of 1 TeV, Majorana neutrinos produced by an effective operator V with masses below 460 GeV are excluded at 95% confidence level. A lower limit of 290 GeV is set at 95% confidence level on the mass of fourth generation d-type quarks.

  • 820. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at root s(NN)=2.76 TeV with the ATLAS detector2012In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 707, no 3-4, p. 330-348Article in journal (Refereed)
    Abstract [en]

    This Letter describes the measurement of elliptic flow of charged particles in lead-lead collisions at root s(NN) = 2.76 TeV using the ATLAS detector at the Large Hadron Collider (LHC). The results are based on an integrated luminosity of approximately 7 mu b(-1). Elliptic flow is measured over a wide region in pseudorapidity, vertical bar eta vertical bar < 2.5, and over a broad range in transverse momentum, 0.5 < p(T) < 20 GeV. The elliptic flow parameter nu(2) is obtained by correlating individual tracks with the event plane measured using energy deposited in the forward calorimeters. As a function of transverse momentum, nu(2)(p(T)) reaches a maximum at p(T) of about 3 GeV. then decreases and becomes weakly dependent on p(T) above 7-8 GeV. Over the measured pseudorapidity region, nu(2) is found to be only weakly dependent on eta, with less variation than observed at lower beam energies. The results are discussed in the context of previous measurements at lower collision energies, as well as recent results from the LHC.

  • 821. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of W gamma and Z gamma production in proton-proton collisions at root s=7 TeV with the ATLAS detector2011In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, p. 072-Article in journal (Refereed)
    Abstract [en]

    We present studies of W and Z bosons with associated high energy photons produced in pp collisions at root s = 7 TeV. The analysis uses 35 pb(-1) of data collected by the ATLAS experiment in 2010. The event selection requires W and Z bosons decaying into high pT leptons (electrons or muons) and a photon with E(T) > 15 GeV separated from the lepton(s) by a distance Delta R(l, gamma) > 0.7 in eta-phi space. A total of 95 (97) pp -> e(+/-)nu gamma + X (pp -> mu(+/-)nu gamma + X) and 25 (23) pp -> e(+)e(-)gamma + X (pp -> mu(+)mu(-)gamma + X) event candidates are selected. The kinematic distributions of the leptons and photons and the production cross sections are measured. The data are found to agree with Standard Model predictions that include next-to-leading-order O(alpha alpha(s)) contributions.

  • 822. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Performance of the ATLAS Trigger System in 20102012In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 72, no 1, p. 1849-Article in journal (Refereed)
    Abstract [en]

    Proton-proton collisions at root s = 7 TeV and heavy ion collisions at root(NN)-N-s = 2.76 TeV were produced by the LHC and recorded using the ATLAS experiment's trigger system in 2010. The LHC is designed with a maximum bunch crossing rate of 40 MHz and the ATLAS trigger system is designed to record approximately 200 of these per second. The trigger system selects events by rapidly identifying signatures of muon, electron, photon, tau lepton, jet, and B meson candidates, as well as using global event signatures, such as missing transverse energy. An overview of the ATLAS trigger system, the evolution of the system during 2010 and the performance of the trigger system components and selections based on the 2010 collision data are shown. A brief outline of plans for the trigger system in 2011 is presented.

  • 823. Aad, G.
    et al.
    Bélanger-Champagne, Camille
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Limits on the production of the standard model Higgs boson in pp collisions at root s=7 TeV with the ATLAS detector2011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 9, p. 1728-Article in journal (Refereed)
    Abstract [en]

    A search for the Standard Model Higgs boson at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV is reported, based on a total integrated luminosity of up to 40 pb(-1) collected by the ATLAS detector in 2010. Several Higgs boson decay channels: H -> gamma gamma, H -> ZZ(()*()) -> llll, H -> ZZ -> LL nu nu, H -> ZZ -> llqq, H -> WW(()*()) -> l nu l nu and H -> WW -> l nu qq (l is e, mu) are combined in a mass range from 110 GeV to 600 GeV. The highest sensitivity is achieved in the mass range between 160 GeV and 170 GeV, where the expected 95% CL exclusion sensitivity is at Higgs boson production cross sections 2.3 times the Standard Model prediction. Upper limits on the cross section for its production are determined. Models with a fourth generation of heavy leptons and quarks with Standard Model-like couplings to the Higgs boson are also investigated and are excluded at 95% CL for a Higgs boson mass in the range from 140 GeV to 185 GeV. 

  • 824. Aad, G.
    et al.
    Kuutmann Bergeås, Elin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P. O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurements of top-quark pair differential cross-sections in the lepton plus jets channel in pp collisions at root s=8 TeV using the ATLAS detector2016In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, no 10, article id 538Article in journal (Refereed)
    Abstract [en]

    Measurements of normalized differential cross-sections of top-quark pair production are presented as a function of the top-quark, t (t) over bar system and event-level kinematic observables in proton-proton collisions at a centre-of-mass energy of root s = 8 TeV. The observables have been chosen to emphasize the t (t) over bar production process and to be sensitive to effects of initial-and final-state radiation, to the different parton distribution functions, and to non-resonant processes and higher-order corrections. The dataset corresponds to an integrated luminosity of 20.3 fb(-1), recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider. Events are selected in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of the jets tagged as originating from a b-quark. The measured spectra are corrected for detector effects and are compared to several Monte Carlo simulations. The results are in fair agreement with the predictions over a wide kinematic range. Nevertheless, most generators predict a harder top-quark transverse momentum distribution at high values than what is observed in the data. Predictions beyond NLO accuracy improve the agreement with data at high top-quark transverse momenta. Using the current settings and parton distribution functions, the rapidity distributions are not well modelled by any generator under consideration. However, the level of agreement is improved when more recent sets of parton distribution functions are used.

  • 825. Aad, G.
    et al.
    Kuutmann, Elin Bergeås
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrando, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camila
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at root s=8 TeV Using the ATLAS Detector2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 14, article id 142001Article in journal (Refereed)
    Abstract [en]

    A measurement of spin correlation in t (t) over bar production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb(-1). The correlation between the top and antitop quark spins is extracted from dilepton t (t) over bar events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to A(helicity) = 0.38 +/- 0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

  • 826. Aad, L.
    et al.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Buszello, Claus P.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isaksson, Charlie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Pelikan, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    A search for t(t)over-bar resonances in lepton plus jets events with highly boosted top quarks collected in pp collisions at root s=7 TeV with the ATLAS detector2012In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 9, p. 041-Article in journal (Refereed)
    Abstract [en]

    A search for resonant production of high-mass top-quark pairs is performed on 2.05 fb(-1) of proton-proton collisions at root s = 7 TeV collected in 2011 with the ATLAS experiment at the Large Hadron Collider. This analysis of the lepton+jets final state is specifically designed for the particular topology that arises from the decay of highly boosted top quarks. The observed t (t) over bar invariant mass spectrum is found to be compatible with the Standard Model prediction and 95% credibility level upper limits are derived on the t (t) over bar production rate through new massive states. An upper limit of 0.7 pb is set on the production cross section times branching fraction of a narrow 1 TeV resonance. A Kaluza-Klein gluon with a mass smaller than 1.5 TeV is excluded.

  • 827. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alderweireld, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W. -D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K. -H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Berntzon, L.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Buschbeck, B.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, Ph.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costa, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    Dalmau, J.
    da Silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Elsing, M.
    Santo, M. C. Espirito
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Herr, H.
    Hoffman, J.
    Holmgren, S. -O
    Holt, P. J.
    Houlden, M. A.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Johansson, P. D.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J. -C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nicolaidou, R.
    Nikolenko, M.
    Niss, P.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouraou, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Rames, J.
    Read, A.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarelli, T.
    Taffard, A. C.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M. -L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Walck, C.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    Masses, lifetimes and production rates of Xi(-) and Xi(+) at LEP 12006In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 639, no 3-4, p. 179-191Article in journal (Refereed)
    Abstract [en]

    Measurements of the Xi(-) and (Xi) over bar (+) masses, mass differences, lifetimes and lifetime differences are presented. The (Xi) over bar (+) sample used is much larger than those used previously for such measurements. In addition, the S production rates in Z -> b (b) over bar and Z -> q (q) over bar events are compared and the position xi* of the maximum of the distribution in Z -> q (q) over bar events is measured.

  • 828. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alderweireld, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W. -D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrerol, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K. -H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Berntzon, L.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Biom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Bugge, L.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, P.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costal, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    Dalmau, J.
    da Silva, T.
    da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Dris, M.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Elsing, M.
    Santo, M. C. Espirito
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, P.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Herr, H.
    Hoffman, J.
    Holmgren, S. -O
    Holt, P. J.
    Houlden, M. A.
    Hultqvist, K.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Johansson, P. D.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    Kiiskinen, A.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J. -C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouracu, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, T. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Rames, J.
    Read, A.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Segar, A.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarelli, T.
    Taffard, A. C.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M. -L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Lysebetten, A.
    van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    Search for excited leptons in e(+)e(-) collisions at root s=189-209 GeV2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, no 2, p. 277-293Article in journal (Refereed)
    Abstract [en]

    A search for excited lepton production in e(+)e(-) collisions was performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies ranging from 189 GeV to 209 GeV, corresponding to an integrated luminosity of approximately 600 pb(-1). No evidence for excited lepton production was found. In searches for pair-produced excited leptons, lower mass limits were established in the range 94-103 GeV/c(2), depending on the channel and model assumptions. In searches for singly-produced excited leptons, upper limits on the parameter f/Lambda were established as a function of the mass.

  • 829. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alderweireld, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W-D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambadeo, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K-H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Berntzon, L.
    Bertrand, D.
    Besancono, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekampo, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Bouqueto, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Bugge, L.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, P.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Ciesliklg, K.
    Collins, P.
    Contri, R.
    Cosmeo, G.
    Cossutti, F.
    Costaso, M. J.
    Crenne, D.
    Cuevas, J.
    D'Hondt, J.
    Dalmau, J.
    da Silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Dris, M.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Elsing, M.
    Espirito Santo, M. C.
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garciao, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidiero, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Herrb, H.
    Hoffman, J.
    Holmgren, S-O
    Holt, P. J.
    Houlden, M. A.
    Hultqvist, K.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Johansson, P. D.
    Jonsson, P.
    JoramB, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    Kiiskinen, A.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczykl, M.
    Lamsal, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitnero, R.
    Lemonne, J.
    Lepeltiero, V.
    Lesiakl, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J-C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraess, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Murynl, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Oraval, R.
    Osterberg, K.
    Ouraou, A.
    Oyangureno, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsao, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Rames, J.
    Read, A.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Riverol, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeauo, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Segar, A.
    Sekulin, R.
    Siebe, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarellis, T.
    Taffard, A. C.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosao, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M-L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Lysebetten, A.
    van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova'o, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    A measurement of the tau hadronic branching ratios2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, no 1, p. 1-26Article in journal (Refereed)
    Abstract [en]

    The exclusive and semi-exclusive branching ratios of the tau lepton hadronic decay modes (h(-)upsilon(tau), h(-)pi(0)upsilon(tau), h(-)pi(0)pi(0)upsilon(tau), h(-) >= 2 pi(0)nu(tau), 2h(-)h(+)upsilon(tau), 2h(-)h(+)>= 2 pi(0)upsilon(tau), 3h(-)2h(+)upsilon(tau) and 3h(-)2h(+) >= 1 pi(0)upsilon(tau)) were measured with data from the DELPHI detector at LEP.

  • 830. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W-D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K-H
    Begalli, M.
    Behrmann, A.
    Belous, K.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Buschbeck, B.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, Ph.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costa, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    da silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Elsing, M.
    Espirito Santo, M. C.
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Hoffman, J.
    Holmgren, S-O
    Holt, P. J.
    Houlden, M. A.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J-C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nemecek, S.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouraou, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Radojicic, D.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Slominski, W.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Szwed, J.
    Tabarelli, T.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M-L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    Measurement of the electron structure function F-2(e) at LEP energies2014In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 737, p. 39-47Article in journal (Refereed)
    Abstract [en]

    The hadronic part of the electron structure function F-2(e) has been measured for the first time, using e(+)e(-) data collected by the DELPHI experiment at LEP, at centre-of-mass energies of root s = 91.2-209.5 GeV. The data analysis is simpler than that of the measurement of the photon structure function. The electron structure function F-2(e) data are compared to predictions of phenomenological models based on the photon structure function. It is shown that the contribution of large target photon virtualities is significant. The data presented can serve as a cross-check of the photon structure function F-2(gamma) analyses and help in refining existing parameterisations.

  • 831. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W-D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K-H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Berntzon, L.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Buschbeck, B.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, Ph.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costa, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    Dalmau, J.
    Da Silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    De Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences. Uppsala University, Department of Radiation Sciences.
    Elsing, M.
    Santo, M. C. Espirito
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences. Uppsala University, Department of Radiation Sciences.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Herr, H.
    Hoffman, J.
    Holmgren, S-O
    Holt, P. J.
    Houlden, M. A.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Johansson, P. D.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J-C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaro, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouraou, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Rames, J.
    Read, A.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarelli, T.
    Taffard, A. C.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Radiation Sciences.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M-L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    Investigation of colour reconnection in WW events with the DELPHI detector at LEP-22007In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 51, no 2, p. 249-269Article in journal (Refereed)
    Abstract [en]

    In the reaction e(+)e(-) -> WW -> (q(1) (q) over bar (2))(q(3)(q) over bar (4)) the usual hadronization models treat the colour singlets q(1)(q) over bar (2) and q(3)(q) over bar (4) coming from two W bosons independently. However, since the. nal state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This e. ect is known as colour reconnection. In this article the results of the investigation of colour reconnection e. ects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle. ow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its. parameter most compatible with the data was found to be: (SK)-S-kappa-I = 2.2(-1.3) (+2.5) corresponding to the probability of reconnection P-reco to be in the range 0.31 < P-reco < 0.68 at 68% confidence level with its best value at 0.52.

  • 832. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W-D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barker, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K-H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Buschbeck, B.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, Ph.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costa, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    da Silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Elsing, M.
    Santo, M. C. Espirito
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Hoffman, J.
    Holmgren, S-O
    Holt, P. J.
    Houlden, M. A.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J-C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nemecek, S.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Oliveira, O.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouraou, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Radojicic, D.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarelli, T.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M-L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    Search for single top quark production via contact interactions at LEP22011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 2, p. 1555-Article in journal (Refereed)
    Abstract [en]

    Single top quark production via four-fermion contact interactions associated to flavour-changing neutral currents was searched for in data taken by the DELPHI detector at LEP2. The data were accumulated at centre-of-mass energies ranging from 189 to 209 GeV, with an integrated luminosity of 598.1 pb(-1). No evidence for a signal was found. Limits on the energy scale Lambda, were set for scalar-, vector- and tensor-like coupling scenarios.

  • 833. Abdallah, J.
    et al.
    Abreu, P.
    Adam, W.
    Adzic, P.
    Albrecht, T.
    Alemany-Fernandez, R.
    Allmendinger, T.
    Allport, P. P.
    Amaldi, U.
    Amapane, N.
    Amato, S.
    Anashkin, E.
    Andreazza, A.
    Andringa, S.
    Anjos, N.
    Antilogus, P.
    Apel, W-D
    Arnoud, Y.
    Ask, S.
    Asman, B.
    Augustin, J. E.
    Augustinus, A.
    Baillon, P.
    Ballestrero, A.
    Bambade, P.
    Barbier, R.
    Bardin, D.
    Barkerd, G. J.
    Baroncelli, A.
    Battaglia, M.
    Baubillier, M.
    Becks, K-H
    Begalli, M.
    Behrmann, A.
    Ben-Haim, E.
    Benekos, N.
    Benvenuti, A.
    Berat, C.
    Berggren, M.
    Bertrand, D.
    Besancon, M.
    Besson, N.
    Bloch, D.
    Blom, M.
    Bluj, M.
    Bonesini, M.
    Boonekamp, M.
    Booth, P. S. L.
    Borisov, G.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bouquet, B.
    Bowcock, T. J. V.
    Boyko, I.
    Bracko, M.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brodet, E.
    Bruckman, P.
    Brunet, J. M.
    Buschbeck, B.
    Buschmann, P.
    Calvi, M.
    Camporesi, T.
    Canale, V.
    Carena, F.
    Castro, N.
    Cavallo, F.
    Chapkin, M.
    Charpentier, Ph.
    Checchia, P.
    Chierici, R.
    Chliapnikov, P.
    Chudoba, J.
    Chung, S. U.
    Cieslik, K.
    Collins, P.
    Contri, R.
    Cosme, G.
    Cossutti, F.
    Costa, M. J.
    Crennell, D.
    Cuevas, J.
    D'Hondt, J.
    da Silva, T.
    Da Silva, W.
    Della Ricca, G.
    De Angelis, A.
    De Boer, W.
    De Clercq, C.
    De Lotto, B.
    De Maria, N.
    De Min, A.
    de Paula, L.
    Di Ciaccio, L.
    Di Simone, A.
    Doroba, K.
    Drees, J.
    Eigen, G.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Elsing, M.
    Santo, M. C. Espirito
    Fanourakis, G.
    Fassouliotis, D.
    Feindt, M.
    Fernandez, J.
    Ferrer, A.
    Ferro, F.
    Flagmeyer, U.
    Foeth, H.
    Fokitis, E.
    Fulda-Quenzer, F.
    Fuster, J.
    Gandelman, M.
    Garcia, C.
    Gavillet, Ph.
    Gazis, E.
    Gokieli, R.
    Golob, B.
    Gomez-Ceballos, G.
    Goncalves, P.
    Graziani, E.
    Grosdidier, G.
    Grzelak, K.
    Guy, J.
    Haag, C.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hamacher, K.
    Hamilton, K.
    Haug, S.
    Hauler, F.
    Hedberg, V.
    Hennecke, M.
    Hoffman, J.
    Holmgren, S-O
    Holt, P. J.
    Houlden, M. A.
    Jackson, J. N.
    Jarlskog, G.
    Jarry, P.
    Jeans, D.
    Johansson, E. K.
    Jonsson, P.
    Joram, C.
    Jungermann, L.
    Kapusta, F.
    Katsanevas, S.
    Katsoufis, E.
    Kernel, G.
    Kersevan, B. P.
    Kerzel, U.
    King, B. T.
    Kjaer, N. J.
    Kluit, P.
    Kokkinias, P.
    Kourkoumelis, C.
    Kouznetsov, O.
    Krumstein, Z.
    Kucharczyk, M.
    Lamsa, J.
    Leder, G.
    Ledroit, F.
    Leinonen, L.
    Leitner, R.
    Lemonne, J.
    Lepeltier, V.
    Lesiak, T.
    Liebig, W.
    Liko, D.
    Lipniacka, A.
    Lopes, J. H.
    Lopez, J. M.
    Loukas, D.
    Lutz, P.
    Lyons, L.
    MacNaughton, J.
    Malek, A.
    Maltezos, S.
    Mandl, F.
    Marco, J.
    Marco, R.
    Marechal, B.
    Margoni, M.
    Marin, J-C
    Mariotti, C.
    Markou, A.
    Martinez-Rivero, C.
    Masik, J.
    Mastroyiannopoulos, N.
    Matorras, F.
    Matteuzzi, C.
    Mazzucato, F.
    Mazzucato, M.
    Mc Nulty, R.
    Meroni, C.
    Migliore, E.
    Mitaroff, W.
    Mjoernmark, U.
    Moa, T.
    Moch, M.
    Moenig, K.
    Monge, R.
    Montenegro, J.
    Moraes, D.
    Moreno, S.
    Morettini, P.
    Mueller, U.
    Muenich, K.
    Mulders, M.
    Mundim, L.
    Murray, W.
    Muryn, B.
    Myatt, G.
    Myklebust, T.
    Nassiakou, M.
    Navarria, F.
    Nawrocki, K.
    Nemecek, S.
    Nicolaidou, R.
    Nikolenko, M.
    Oblakowska-Mucha, A.
    Obraztsov, V.
    Olshevski, A.
    Onofre, A.
    Orava, R.
    Osterberg, K.
    Ouraou, A.
    Oyanguren, A.
    Paganoni, M.
    Paiano, S.
    Palacios, J. P.
    Palka, H.
    Papadopoulou, Th. D.
    Pape, L.
    Parkes, C.
    Parodi, F.
    Parzefall, U.
    Passeri, A.
    Passon, O.
    Peralta, L.
    Perepelitsa, V.
    Perrotta, A.
    Petrolini, A.
    Piedra, J.
    Pieri, L.
    Pierre, F.
    Pimenta, M.
    Piotto, E.
    Podobnik, T.
    Poireau, V.
    Pol, M. E.
    Polok, G.
    Pozdniakov, V.
    Pukhaeva, N.
    Pullia, A.
    Radojicic, D.
    Rebecchi, P.
    Rehn, J.
    Reid, D.
    Reinhardt, R.
    Renton, P.
    Richard, F.
    Ridky, J.
    Rivero, M.
    Rodriguez, D.
    Romero, A.
    Ronchese, P.
    Roudeau, P.
    Rovelli, T.
    Ruhlmann-Kleider, V.
    Ryabtchikov, D.
    Sadovsky, A.
    Salmi, L.
    Salt, J.
    Sander, C.
    Savoy-Navarro, A.
    Schwickerath, U.
    Sekulin, R.
    Siebel, M.
    Sisakian, A.
    Smadja, G.
    Smirnova, O.
    Sokolov, A.
    Sopczak, A.
    Sosnowski, R.
    Spassov, T.
    Stanitzki, M.
    Stocchi, A.
    Strauss, J.
    Stugu, B.
    Szczekowski, M.
    Szeptycka, M.
    Szumlak, T.
    Tabarelli, T.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Timmermans, J.
    Tkatchev, L.
    Tobin, M.
    Todorovova, S.
    Tome, B.
    Tonazzo, A.
    Tortosa, P.
    Travnicek, P.
    Treille, D.
    Tristram, G.
    Trochimczuk, M.
    Troncon, C.
    Turluer, M-L
    Tyapkin, I. A.
    Tyapkin, P.
    Tzamarias, S.
    Uvarov, V.
    Valenti, G.
    Van Dam, P.
    Van Eldik, J.
    Van Remortel, N.
    Van Vulpen, I.
    Vegni, G.
    Veloso, F.
    Venus, W.
    Verdier, P.
    Verzi, V.
    Vilanova, D.
    Vitale, L.
    Vrba, V.
    Wahlen, H.
    Washbrook, A. J.
    Weiser, C.
    Wicke, D.
    Wickens, J.
    Wilkinson, G.
    Winter, M.
    Witek, M.
    Yushchenko, O.
    Zalewska, A.
    Zalewski, P.
    Zavrtanik, D.
    Zhuravlov, V.
    Zimin, N. I.
    Zintchenko, A.
    Zupan, M.
    A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole2011In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 2, p. 1557-Article in journal (Refereed)
    Abstract [en]

    The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, E-B(weak). The average value of x(B)(weak) = E-B(weak)/E-beam is measured to be 0.699 +/- 0.011. The resulting x(B)(weak) distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of b-hadron production in other experimental environments than LEP. In the parton shower framework, data favour the Lund model ansatz and corresponding values of its parameters have been determined within PYTHIA 6.156 from DELPHI data: a = 1.84(-0.21)(+0.23) and b = 0.642(-0.063)(+0.073) GeV-2, with a correlation factor rho = 92.2%. Combining the data on the b-quark fragmentation distributions with those obtained at the Z peak by ALEPH, OPAL and SLD, the average value of x(B)(weak) is found to be 0.7092 +/- 0.0025 and the non-perturbative fragmentation component is extracted. Using the combined distribution, a better determination of the Lund parameters is also obtained: a = 1.48(-0.10)(+0.11) and b = 0.509(-0.023)(+0.024) GeV-2, with a correlation factor rho = 92.6%.

  • 834. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    A Determination of the centre-of-mass energy at LEP2 using radiative 2-fermion events2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, no 2, p. 295-305Article in journal (Refereed)
    Abstract [en]

    Using e(+)e(-) -> mu(+)mu(-)(gamma) and e(+)e(-) -> q (q) over bar(gamma) events radiative to the Z pole, DELPHI has determined the centre-of-mass energy, root s, using energy and momentum constraint methods. The results are expressed as deviations from the nominal LEP centre-of-mass energy, measured using other techniques. The results are found to be compatible with the LEP Energy Working Group estimates for a combination of the 1997 to 2000 data sets.

  • 835. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    Determination of the b quark mass at the M-Z scale with the DELPHI detector at LEP2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, no 3, p. 569-583Article in journal (Refereed)
    Abstract [en]

    An experimental study of the normalized three-jet rate of b quark events with respect to light quarks events (light = l equivalent to u, d, s) has been performed using the CAMBRIDGE and DURHAM jet algorithms. The data used were collected by the DELPHI experiment at LEP on the Z peak from 1994 to 2000. The results are found to agree with theoretical predictions treating mass corrections at next-to-leading order. Measurements of the b quark mass have also been performed for both the b pole mass: M-b and the b running mass: m(b)(M-Z). Data are found to be better described when using the running mass. The measurement yields:

    m(b)(M-Z) = 2.85 +/- 0.18(stat) +/- 0.13(exp) +/- 0.19(had) +/- 0.12(theo) GeV/c(2).

    for the CAMBRIDGE algorithm. This result is the most precise measurement of the b mass derived from a high energy process. When compared to other b mass determinations by experiments at lower energy scales, this value agrees with the prediction of quantum chromodynamics for the energy evolution of the running mass. The mass measurement is equivalent to a test of the flavour independence of the strong coupling constant with an accuracy of 7 parts per thousand.

  • 836. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    Evidence for an excess of soft photons in hadronic decays of Z(0)2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 47, no 2, p. 273-294Article in journal (Refereed)
    Abstract [en]

    Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq disintegrations of the Z(0) were studied in the kinematic range 0.2 < E-y < I GeV and transverse momentum with respect to the closest jet direction P-T < 80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17 +/- 0.06 +/- 0.27) x 10(-3) gamma/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340 +/- 0.001 +/- 0.038) X 10(-3) gamma/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4 +/- 0.2 +/- 0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

  • 837. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    Measurement and interpretation of fermion-pair production at LEP energies above the Z resonance2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 45, no 3, p. 589-632Article in journal (Refereed)
    Abstract [en]

    This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e(+)e(-) -> f (f) over bar process for centre-of-mass energies above the Z resonance, from root s similar to 130-207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e(+)e(-) -> f (f) over bar scattering and several models which include physics beyond the Standard Model: the exchange of Z' bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of (v) over tilde in R-parity violating supersymmetry.

  • 838. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    Single intermediate vector boson production in e(+)e(-) collisions at root s=183-209 GeV2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 45, no 2, p. 273-289Article in journal (Refereed)
    Abstract [en]

    The production of single charged and neutral intermediate vector bosons in e(+)e(-) collisions has been studied in the data collected by the DELPHI experiment at LEP at centre-of-mass energies between 183 and 209 GeV, corresponding to an integrated luminosity of about 640 pb(-1). The measured cross-sections for the reactions, determined in limited kinematic regions, are in agreement with the Standard Model predictions.

  • 839. Abdallah, J.
    et al.
    Botner, Olga
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Tegenfeldt, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Zupan, M.
    Study of double-tagged gamma gamma events at LEPII2006In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 46, no 3, p. 559-568Article in journal (Refereed)
    Abstract [en]

    Double-tagged interactions of photons with virtualities Q(2) between 10 GeV2 and 200 GeV2 are studied with the data collected by DELPHI at LEPII from 1998 to 2000, corresponding to an integrated luminosity of 550 pb(-1). The gamma*gamma* -> mu(+)mu(-) data agree with QED predictions. The cross-section of the reaction gamma*gamma* -> hadrons is measured and compared to the LO and NLO BFKL calculations.

  • 840.
    Angerami, Aaron
    et al.
    Columbia University, New York, NY 10027, USA.
    Bergeås Kuutmann, Elin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bokan, Petar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P. O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isacson, Max
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Mårtensson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel Smith, Camila
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Sales De Bruin, Pedro
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurements of photo-nuclear jet production in Pb plus Pb collisions with ATLAS2017In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 967, p. 277-280Article in journal (Refereed)
    Abstract [en]

    Ultra-peripheral heavy ion collisions provide a unique opportunity to study the parton distributions in the colliding nuclei via the measurement of photo-nuclear jet production. An analysis of jet production in ultra-peripheral Pb+Pb collisions at root S-NN = 5.02 TeV performed using data collected with the ATLAS detector in 2015 is described. The data set corresponds to a total Pb+Pb integrated luminosity of 0.38 nb(-1). The ultra-peripheral collisions are selected using a combination of forward neutron and rapidity gap requirements. The cross-sections, not unfolded for detector response, are compared to results from PYTHIA Monte Carlo simulations re-weighted to match a photon spectrum obtained from the STARLIGHT model. Qualitative agreement between data and these simulations is observed over a broad kinematic range suggesting that using these collisions to measure nuclear parton distributions is experimentally realisable.

  • 841. Appleton, Owen
    et al.
    Cameron, David
    Cernák, Jozef
    Dóbé, Péter
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Frågåt, Thomas
    Grønager, Michael
    Johansson, Daniel
    Jönemo, Johan
    Kleist, Josva
    Kocan, Marek
    Konstantinov, Aleksandr
    Kónya, Balázs
    Márton, Iván
    Mohn, Bjarte
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Möller, Steffen
    Müller, Henning
    Nagy, Zsombor
    Nilsen, Jon K.
    Ould-Saada, Farid
    Pajchel, Katarina
    Qiang, Weizhong
    Read, Alexander
    Rosendahl, Peter
    Röczei, Gábor
    Savko, Martin
    Skou Andersen, Martin
    Smirnova, Oxana
    Stefán, Péter
    Szalai, Ferenc
    Taga, Adrian
    Toor, Salman Z.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computational Science.
    Wäänänen, Anders
    Zhou, Xin
    The next-generation ARC middleware2010In: Annales des télécommunications, ISSN 0003-4347, E-ISSN 1958-9395, Vol. 65, p. 771-776Article in journal (Refereed)
  • 842. Balek, Petr
    et al.
    Asimakopoulou, Eleni M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bergeås Kuutmann, Elin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bokan, Petar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P. O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isacson, M. F.
    Mårtensson, Mikael U. F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Sales De Bruin, Pedro
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Charged-hadron suppression in Pb plus Pb and Xe plus Xe collisions measured with the ATLAS detector2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 571-574Article in journal (Refereed)
    Abstract [en]

    The ATLAS detector at the LHC recorded 0.49 nb(-1) of Pb+Pb collisions and 25 of pp(-1) collisions, both at the center-of-mass energy 5.02 TeV per nucleon pair. Recently, ATLAS also recorded 30 mu b(-1) of Xe+Xe collisions at the center-of-mass energy 5.44 TeV, which provides a new opportunity to study the system-size dependence of the charged-hadron production in heavy-ion collisions. The large acceptance of the ATLAS detector allows to measure the spectra of charged hadrons in a wide range of pseudorapidity and transverse momentum. The nuclear modification factors R-AA are constructed as a ratio of the spectra measured in Pb+Pb or Xe+Xe collisions to that measured in pp collisions. The R-AA obtained in the two systems are presented for different centrality intervals and the results are discussed.

  • 843. Bold, Tomasz
    et al.
    Asimakopoulou, Eleni M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bergeås Kuutmann, Elin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bokan, Petar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P. O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Isacson, Max
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Mårtensson, Mikael U. F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Sales De Bruin, Pedro
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the azimuthal anisotropy of charged particles in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions with ATLAS2019In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 391-394Article in journal (Refereed)
    Abstract [en]

    The data collected by the ATLAS experiment during the 2015 Pb+Pb and 2017 Xe+Xe LHC runs offer new opportunities to study charged particle azimuthal anisotropy. The high-statistics Pb+Pb sample allows for a detailed study of the azimuthal anisotropy of produced particles. This should improve the understanding of initial conditions of nuclear collisions, hydrodynamical behavior of quark-gluon plasma and parton energy loss. New ATLAS measurements of differential and global Fourier harmonics of charged particles (v(n)) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions in a wide range of transverse momenta, pseudorapidity (vertical bar eta vertical bar < 2.5) and collision centrality are presented. The higher order harmonics, sensitive to fluctuations in the initial state, are measured up to n = 7 using the two-particle correlation, cumulant and scalar product methods. The dynamic properties of QGP are studied using a recently-proposed modified Pearson's correlation coefficient, rho(v(n)(2), p(T)), between the event-wise mean transverse momentum and the magnitude of the flow vector in 5.02 TeV Pb+Pb and p+Pb collisions. Several important observations are made. The elliptic and triangular flow harmonics show an interesting universal p(T)-scaling. A linear correlation between the v(2) and v(3) coefficients at low and high p(T) ranges is observed and quantified. The correlation coefficient for v(2) is found to be negative in peripheral and positive in central Pb+Pb collisions. The value for v(3) is found to be much smaller than for v(2) and have similar centrality behavior as the v(2).

  • 844.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    A PRECISE MEASUREMENT OF THE B+, B0 AND MEAN B HADRON LIFETIME WITH THE DELPHI DETECTOR AT LEP12004In: Eur.Phys.J., Vol. C, no 33, p. 307-324Article in journal (Refereed)
  • 845.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    A PRECISE MEASUREMENT OF THE TAU LIFETIME2004In: Eur.Phys.J., Vol. C, no 36, p. 283-296Article in journal (Refereed)
  • 846.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    BOSE-EINSTEIN CORRELATIONS IN W+ W- EVENTS AT LEP22005In: Eur.Phys.J., Vol. C, no 44, p. 161-174Article in journal (Refereed)
  • 847.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    CHARGED PARTICLE MULTIPLICITY IN THREE-JET EVENTS AND TWO-GLUON SYSTEMS2005In: Eur.Phys.J., Vol. C, no 44, p. 311-331Article in journal (Refereed)
  • 848.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    COHERENT SOFT PARTICLE PRODUCTION IN Z DECAYS INTO THREE JETS2005In: Phys.Lett., Vol. B, no 605, p. 37-48Article in journal (Refereed)
  • 849.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    DETERMINATION OF A**B(FB) AT THE Z POLE USING INCLUSIVE CHARGE RECONSTRUCTION AND LIFETIME TAGGING2005In: Eur.Phys.J., Vol. C, no 40, p. 1-25Article in journal (Refereed)
  • 850.
    Botner, Olga
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Brenner, Richard
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ekelöf, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Ellert, Mattias
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    Hallgren, Allan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik.
    DETERMINATION OF THE E+ E- ---> GAMMA GAMMA (GAMMA) CROSS-SECTION AT LEP 22004In: Eur.Phys.J., Vol. C, no 37, p. 405-419Article in journal (Refereed)
1415161718 801 - 850 of 895
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