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Gonzalez Suarez, RebecaORCID iD iconorcid.org/0000-0002-6126-7230
Publications (10 of 61) Show all publications
Gonzalez Suarez, R. (2020). Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrts=13$ TeV.
Open this publication in new window or tab >>Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrts=13$ TeV
2020 (English)In: Article in journal (Refereed) Submitted
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-406617 (URN)
Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10
Mårtensson, M., Isacson, M., Hahne, H., Gonzalez Suarez, R. & Brenner, R. (2019). To catch a long-lived particle: hit selection towards a regional hardware track trigger implementation. Journal of Instrumentation, 14, Article ID P11009.
Open this publication in new window or tab >>To catch a long-lived particle: hit selection towards a regional hardware track trigger implementation
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2019 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id P11009Article in journal (Refereed) Published
Abstract [en]

Conventional searches for new phenomena at collider experiments tend to focus on prompt particles, produced at the interaction point and decaying rapidly. New physics models including long-lived particles that travel a substantial distance in the detectors before decaying provide an interesting alternative, especially in light of the lack of new phenomena at the current LHC experiments, and could solve unanswered questions of the Standard Model. Long-lived particles have characteristic experimental signatures that, while making them clearly distinct from other processes, also could make them potentially invisible to current data-acquisition methods. Specific trigger strategies need to be in place to target long-lived particles. In this paper, we investigate the use of tracker information at trigger level to identify displaced signatures. We propose two methods that can be implemented at hardware-level: one based on the Hough transform, and another based on pattern matching with patterns trained on displaced tracks.

Keywords
Pattern recognition, cluster finding, calibration and fitting methods, Data reduction methods, Particle identification methods, Trigger algorithms
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-391164 (URN)10.1088/1748-0221/14/11/P11009 (DOI)000507589800009 ()
Funder
Swedish Research Council, 2017-05092Swedish Research Council, 2015-04955
Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2020-05-13Bibliographically approved
Gonzalez Suarez, R. (2011). Charged particle multiplicities in $pp$ interactions at $\sqrts=0.9$, 2.36, and 7 TeV. JHEP, 01
Open this publication in new window or tab >>Charged particle multiplicities in $pp$ interactions at $\sqrts=0.9$, 2.36, and 7 TeV
2011 (English)In: JHEP, Vol. 01Article in journal (Refereed) Published
Abstract [en]

Measurements of primary charged hadron multiplicity distributions are pre-sented for non-single-diffractive events in proton-proton collisions at centre-of-mass energiesof√s= 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from|η|<0.5 to|η|<2.4.The data were collected with the minimum-bias trigger of the CMS experiment during theLHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distributionat√s= 0.9 TeV is in agreement with previous measurements. At higher energies the in-crease of the mean multiplicity with√sis underestimated by most event generators. Theaverage transverse momentum as a function of the multiplicity is also presented. The mea-surement of higher-order moments of the multiplicity distribution confirms the violation ofKoba-Nielsen-Olesen scaling that has been observed at lower energies.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370989 (URN)10.1007/JHEP01(2011)079 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). Dijet Azimuthal Decorrelations in $pp$ Collisions at $\sqrts = 7$ TeV. Phys. Rev. Lett., 106
Open this publication in new window or tab >>Dijet Azimuthal Decorrelations in $pp$ Collisions at $\sqrts = 7$ TeV
2011 (English)In: Phys. Rev. Lett., Vol. 106Article in journal (Refereed) Published
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370976 (URN)10.1103/PhysRevLett.106.122003 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). First Measurement of Hadronic Event Shapes in $pp$ Collisions at $\sqrt s=7$ TeV. Phys. Lett., 699(1-2), 48-67
Open this publication in new window or tab >>First Measurement of Hadronic Event Shapes in $pp$ Collisions at $\sqrt s=7$ TeV
2011 (English)In: Phys. Lett., Vol. 699, no 1-2, p. 48-67Article in journal (Refereed) Published
Abstract [en]

Hadronic event shapes have been measured in proton–proton collisions at s=7TeV" role="presentation">s=7TeV" role="presentation">, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2pb&#x2212;1" role="presentation">. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370975 (URN)10.1016/j.physletb.2011.03.060 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrts=7$ TeV. Phys. Lett., B695, 424-443
Open this publication in new window or tab >>First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrts=7$ TeV
2011 (English)In: Phys. Lett., Vol. B695, p. 424-443Article in journal (Refereed) Published
Abstract [en]

The first measurement of the cross section for top-quark pair production in pp collisions at theLarge Hadron Collider at center-of-mass energy√s=7 TeV has been performed using a data samplecorresponding to an integrated luminosity of 3.1±0.3pb−1recorded by the CMS detector. This resultutilizes the final state with two isolated, highly energetic charged leptons, large missing transverseenergy, and two or more jets. Backgrounds from Drell–Yan and non-W/Z boson production are estimatedfrom data. Eleven events are observed in the data with 2.1±1.0 events expected from background. Themeasured cross section is 194±72(stat.)±24(syst.)±21(lumi.)pb, consistent with next-to-leading orderpredicti

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370992 (URN)10.1016/j.physletb.2010.11.058 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). Inclusive b-hadron production cross section with muons in $pp$ collisions at $\sqrts = 7$ TeV. JHEP, 03
Open this publication in new window or tab >>Inclusive b-hadron production cross section with muons in $pp$ collisions at $\sqrts = 7$ TeV
2011 (English)In: JHEP, Vol. 03Article in journal (Refereed) Published
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370977 (URN)10.1007/JHEP03(2011)090 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). Measurement of $B\barB$ Angular Correlations based on Secondary Vertex Reconstruction at $\sqrts=7$ TeV. JHEP, 03
Open this publication in new window or tab >>Measurement of $B\barB$ Angular Correlations based on Secondary Vertex Reconstruction at $\sqrts=7$ TeV
2011 (English)In: JHEP, Vol. 03Article in journal (Refereed) Published
Abstract [en]

A measurement of the angular correlations between beauty and anti-beauty hadrons (BB&#x00AF;" role="presentation">BB¯¯¯¯) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of small angular separation. The B hadrons are identified by the presence of displaced secondary vertices from their decays. The B hadron angular separation is reconstructed from the decay vertices and the primary-interaction vertex. The differential BB&#x00AF;" role="presentation">BB¯¯¯¯ production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 pb−1, shows that a sizable fraction of the BB&#x00AF;" role="presentation">BB¯¯¯¯ pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of bb&#x00AF;" role="presentation">bb¯¯¯ production

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370972 (URN)10.1007/JHEP03(2011)136 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). Measurement of Bose-Einstein Correlations in $pp$ Collisions at $\sqrts=0.9$ and 7 TeV. JHEP, 05
Open this publication in new window or tab >>Measurement of Bose-Einstein Correlations in $pp$ Collisions at $\sqrts=0.9$ and 7 TeV
2011 (English)In: JHEP, Vol. 05Article in journal (Refereed) Published
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370978 (URN)10.1007/JHEP05(2011)029 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
Gonzalez Suarez, R. (2011). Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at $sqrts = 7$ TeV. Phys. Rev. Lett., 106
Open this publication in new window or tab >>Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at $sqrts = 7$ TeV
2011 (English)In: Phys. Rev. Lett., Vol. 106Article in journal (Refereed) Published
Abstract [en]

Dijet angular distributions are measured over a wide range of dijet invariant masses in pp collisions at √s=7  TeV, at the CERN LHC. The event sample, recorded with the CMS detector, corresponds to an integrated luminosity of 36  pb−1. The data are found to be in good agreement with the predictions of perturbative QCD, and yield no evidence of quark compositeness. With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of Λ+=5.6  TeV (Λ−=6.7  TeV) for destructive (constructive) interference is obtained at the 95% confidence level.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-370973 (URN)10.1103/PhysRevLett.106.201804 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2020-03-06Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-6126-7230

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