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Buszello, Claus P
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Publications (10 of 475) Show all publications
Abazov, V. M., Buszello, C. P. & Zivkovic, L. (2021). Odderon Exchange from Elastic Scattering Differences between pp and p(p)over-bar Data at 1.96 TeV and from pp Forward Scattering Measurements. Physical Review Letters, 127(6), Article ID 062003.
Open this publication in new window or tab >>Odderon Exchange from Elastic Scattering Differences between pp and p(p)over-bar Data at 1.96 TeV and from pp Forward Scattering Measurements
2021 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 127, no 6, article id 062003Article in journal (Refereed) Published
Abstract [en]

We describe an analysis comparing the p (p) over bar elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeVusing a model-independent approach. The TOTEM cross sections, extrapolated to a center-of-mass energy of root s = 1.96 TeV, are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the pp cross section. The two data sets disagree at the 3.4s level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering for which the significance is between 3.4s and 4.6s. The combined significance is larger than 5 sigma and is interpreted as the first observation of the exchange of a colorless, C-odd gluonic compound.

Place, publisher, year, edition, pages
American Physical Society, 2021
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-451301 (URN)10.1103/PhysRevLett.127.062003 (DOI)000681176000007 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.127.062003

Available from: 2021-08-27 Created: 2021-08-27 Last updated: 2023-04-27Bibliographically approved
Abazov, V. M., Buszello, C. P. & Zivkovic, L. (2021). Study of the normalized transverse momentum distribution of W bosons produced in p(p)over-bar collisions at root s=1.96 TeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 103(1), Article ID 012003.
Open this publication in new window or tab >>Study of the normalized transverse momentum distribution of W bosons produced in p(p)over-bar collisions at root s=1.96 TeV
2021 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 103, no 1, article id 012003Article in journal (Refereed) Published
Abstract [en]

We present a study of the normalized transverse momentum distribution of W bosons produced in p (p) over bar collisions, using data corresponding to an integrated luminosity of 4.35 fb(-1) collected with the D0 detector at the Fermilab Tevatron collider at root s = 1.96 TeV. The measurement focuses on the transverse momentum region below 15 GeV, which is of special interest for electroweak precision measurements; it relies on the same detector calibration methods which were used for the precision measurement of the W boson mass. The measured distribution is compared to different QCD predictions and a procedure is given to allow the comparison of any further theoretical models to the D0 data.

Place, publisher, year, edition, pages
American Physical SocietyAMER PHYSICAL SOC, 2021
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-434448 (URN)10.1103/PhysRevD.103.012003 (DOI)000604830200001 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.103.012003

Available from: 2021-02-12 Created: 2021-02-12 Last updated: 2024-01-15Bibliographically approved
Abazov, V. M., Buszello, C. P. & Zivkovic, L. (2020). Studies of X(3872) and psi(2S) production in p(p)over-bar collisions at 1.96 TeV. Physical Review D, 102(7), Article ID 072005.
Open this publication in new window or tab >>Studies of X(3872) and psi(2S) production in p(p)over-bar collisions at 1.96 TeV
2020 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 102, no 7, article id 072005Article in journal (Refereed) Published
Abstract [en]

We present various properties of the production of the X(3872) and psi(2S) states based on 10.4 fb(-1) collected by the D0 experiment in Tevatron p (p) over bar collisions at root s = 1.96 TeV. For both states, we measure the nonprompt fraction f(NP) of the inclusive production rate due to decays of b-flavored hadrons. We find the f(NP) values systematically below those obtained at the LHC. The f(NP) fraction for psi(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt psi(2S) production, ( 1 - f(NP))/f(NP), decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)pi center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the pi in the X(3872)pi center-of-mass frame expected for the X + soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Lambda = M(pi) is not ruled out.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2020
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-423940 (URN)10.1103/PhysRevD.102.072005 (DOI)000576892700002 ()
Funder
Swedish Research CouncilGerman Research Foundation (DFG)
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.102.072005

Available from: 2020-11-05 Created: 2020-11-05 Last updated: 2020-11-05Bibliographically approved
Abazov, V. M., Buszello, C. P. & Zivkovic, L. (2019). Properties of Z(c)(+/-)(3900) produced in p(p)over-bar collisions. Physical Review D: covering particles, fields, gravitation, and cosmology, 100(1), Article ID 012005.
Open this publication in new window or tab >>Properties of Z(c)(+/-)(3900) produced in p(p)over-bar collisions
2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, no 1, article id 012005Article in journal (Refereed) Published
Abstract [en]

We study the production of the exotic charged charmoniumlike state Z(c)(+/-)(3900) in p (p) over bar collisions through the sequential process psi(4260) -> Z(c)(+/-)(3900)(pi)(-/+), Z(c)(+/-)(3900) -> J/psi pi(+/-). Using the subsample of candidates originating from semi-inclusive weak decays of b-flavored hadrons, we measure the invariant mass and natural width to be M = 3902.6(-5.0)(+5.2)(stat)(-1.4)(+3.3)(syst) MeV and Gamma = 32(-21)(+28)(stat)(-7)(+26)(syst) MeV, respectively. We search for prompt production of the Z(c)(+/-)(3900) through the same sequential process. No significant signal is observed, and we set an upper limit of 0.70 at the 95% credibility level on the ratio of prompt production to the production via b-hadron decays. The study is based on 10.4 fb(-1) of p (p) over bar collision data collected by the D0 experiment at the Fermilab Tevatron collider.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-392581 (URN)10.1103/PhysRevD.100.012005 (DOI)000477896800002 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.012005

Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-09-09Bibliographically approved
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., . . . Zivkovic, L. (2018). Evidence for Z(c)(+/-)(3900) in semi-inclusive decays of b-flavored hadrons. Physical Review D: covering particles, fields, gravitation, and cosmology, 98(5), Article ID 052010.
Open this publication in new window or tab >>Evidence for Z(c)(+/-)(3900) in semi-inclusive decays of b-flavored hadrons
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 5, article id 052010Article in journal (Refereed) Published
Abstract [en]

We present evidence for the exotic charged charmoniumlike state Z(c)(+/-)(3900) decaying to J/psi pi(+/-) in semi-inclusive weak decays of b-flavored hadrons. The signal is correlated with a parent J/psi pi(+)pi(-) system in the invariant-mass range 4.2-4.7 GeV that would include the exotic structure Y(4260). The study is based on 10.4 fb(-1) of p (p) over bar collision data collected by the D0 experiment at the Fermilab Tevatron collider.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-368103 (URN)10.1103/PhysRevD.98.052010 (DOI)000446281700001 ()
Funder
Swedish Research Council
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2018-12-06Bibliographically approved
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., . . . Zivkovic, L. (2018). Measurement of the Effective Weak Mixing Angle in p¯p→Z/γ∗→ℓ+ℓ− Events. Physical Review Letters, 120(24), Article ID 241802.
Open this publication in new window or tab >>Measurement of the Effective Weak Mixing Angle in p¯p→Z/γ∗→ℓ+ℓ− Events
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 24, article id 241802Article in journal (Refereed) Published
Abstract [en]

We present a measurement of the effective weak mixing angle parameter sin(2)theta(l)(eff) in p (p) over bar -> Z/gamma* -> mu(+)mu(-) events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to 8.6 fb(-1) of integrated luminosity. The measured value of sin(2)theta(l)(eff)[mu mu] = 0.23016 +/- 0.00064 is further combined with the result from the D0 measurement in p (p) over bar -> Z/gamma* -> e(+)e(-) events, resulting in sin(2)theta(l)(eff)[comb] = 0.23095 +/- 0.00040. This combined result is the most precise measurement from a single experiment at a hadron collider and is the most precise determination using the coupling of the Z/gamma* to light quarks.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-358381 (URN)10.1103/PhysRevLett.120.241802 (DOI)000435081500002 ()
Funder
Swedish Research Council
Note

Title in WoS: Measurement of the Effective Weak Mixing Angle in p(p)over-bar -> Z/gamma* -> l(+) l(-) Events

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., . . . Zivkovic, L. (2018). Study of the X-+/-(5568) state with semileptonic decays of the B-s(0) meson. Physical Review D: covering particles, fields, gravitation, and cosmology, 97(9), Article ID 092004.
Open this publication in new window or tab >>Study of the X-+/-(5568) state with semileptonic decays of the B-s(0) meson
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 9, article id 092004Article in journal (Refereed) Published
Abstract [en]

We present a study of the X-+/-(5568) using semileptonic decays of the B-s(0) meson using the full run II integrated luminosity of 10.4 fb(-1) in proton-antiproton collisions at a center of mass energy of 1.96 TeV collected with the DO detector at the Fermilab Tevatron Collider. We report evidence for a narrow structure, X-+/-(5568), in the decay sequence X-+/-(5568) -> B-s(0) pi(+/-) where B-s(0)-> mu(-/+) (DsX)-X-+/-, D-s(+/-)-> phi pi(+/-)which is consistent with the previous measurement by the DO Collaboration in the hadronic decay mode, X-+/-(5568) -> B-s(0)pi(+/-) where B-s(0 )-> J/psi phi. The mass and width of this state are measured using a combined fit of the hadronic and semileptonic data, yielding m = 5566.9(-3.1)(+3.2)(stat)(-1.2)(+0.6)(syst) MeV/c(2), Gamma = 18.6(-6.1)(+7.9)(stat)(-3.8)(+3.5) (syst) McV/c(2) with a significance of 6.7 sigma.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-357280 (URN)10.1103/PhysRevD.97.092004 (DOI)000433027600002 ()
Funder
Swedish Research Council
Available from: 2018-08-17 Created: 2018-08-17 Last updated: 2018-08-17Bibliographically approved
Aaltonen, T., Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., . . . Zucchelli, S. (2018). Tevatron Run II combination of the effective leptonic electroweak mixing angle. Physical Review D: covering particles, fields, gravitation, and cosmology, 97(11), Article ID 112007.
Open this publication in new window or tab >>Tevatron Run II combination of the effective leptonic electroweak mixing angle
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 11, article id 112007Article in journal (Refereed) Published
Abstract [en]

Drell-Yan lepton pairs produced in the process p (p) over bar -> l(+)l(-) + X through an intermediate gamma*/Z boson have an asymmetry in their angular distribution related to the spontaneous symmetry breaking of the electroweak force and the associated mixing of its neutral gauge bosons. The CDF and D0 experiments have measured the effective-leptonic electroweak mixing parameter sin(2) theta(lept)(eff) using electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-2011, corresponding to 9-10 fb(-1) of integrated luminosity. The combination of these measurements yields the most precise result from hadron colliders, sin(2)theta(lept)(eff) = 0.23148 +/- 0.00033. This result is consistent with, and approaches in precision, the best measurements from electron-positron colliders. The standard model inference of the on-shell electroweak mixing parameter sin(2) theta(W), or equivalently the W-boson mass M-W, using the ZFITTER software package yields sin(2) theta(W) = 0.22324 +/- 0.00033 or equivalently, M-W = 80.367 +/- 0.017 GeV/c(2).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-360446 (URN)10.1103/PhysRevD.97.112007 (DOI)000436628000001 ()
Funder
Swedish Research Council
Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2018-09-13Bibliographically approved
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., . . . Zivkovic, L. (2017). Measurement of the direct CP violating charge asymmetry in B-+/- -> mu(+/-)nu D-mu(0) decays. Physical Review D: covering particles, fields, gravitation, and cosmology, 95(3), Article ID 031101.
Open this publication in new window or tab >>Measurement of the direct CP violating charge asymmetry in B-+/- -> mu(+/-)nu D-mu(0) decays
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2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 95, no 3, article id 031101Article in journal (Refereed) Published
Abstract [en]

We present the first measurement of the CP violating charge asymmetry in B-+/- -> mu(+/-)nu D-mu(0) decays using the full Run II integrated luminosity of 10.4 fb(-1) in proton-antiproton collisions collected with the D0 detector at the Fermilab Tevatron Collider. We measure a difference in the yield of B- and B+ mesons in these decays by fitting the reconstructed invariant mass distributions. This results in an asymmetry of A(mu D0) = [-0.14 +/- 0.20] %, which is consistent with standard model predictions.

National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-317950 (URN)10.1103/PhysRevD.95.031101 (DOI)000393509100001 ()
Available from: 2017-04-03 Created: 2017-04-03 Last updated: 2017-11-29Bibliographically approved
Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., . . . Zivkovic, L. (2017). Measurement of top quark polarization in t(t)over-bar lepton+jets final states. PHYSICAL REVIEW D, 95(1), Article ID 011101.
Open this publication in new window or tab >>Measurement of top quark polarization in t(t)over-bar lepton+jets final states
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2017 (English)In: PHYSICAL REVIEW D, ISSN 2470-0010, Vol. 95, no 1, article id 011101Article in journal (Refereed) Published
Abstract [en]

We present a measurement of top quark polarization in t (t) over bar pair production in p (p) over bar collisions at root s = 1.96 TeV using data corresponding to 9.7 fb(-1) of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. We consider final states containing a lepton and at least three jets. The polarization is measured through the distribution of lepton angles along three axes: the beam axis, the helicity axis, and the transverse axis normal to the t (t) over bar production plane. This is the first measurement of top quark polarization at the Tevatron using lepton + jet final states and the first measurement of the transverse polarization in t (t) over bar production. The observed distributions are consistent with standard model predictions of nearly no polarization.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-316038 (URN)10.1103/PhysRevD.95.011101 (DOI)000391860700001 ()
Funder
German Research Foundation (DFG)Swedish Research Council
Available from: 2017-02-27 Created: 2017-02-27 Last updated: 2017-02-27Bibliographically approved
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