Rights statement: © 2013 CERN, for the ATLAS Collaboration
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Measurement of upsilon production in 7 TeV pp collisions at ATLAS
AU - Jones, Roger
AU - Chilingarov, Alexandre
AU - Kartvelishvili, Vakhtang
AU - Love, Peter
AU - Borissov, Guennadi
AU - Fox, Harald
AU - Smizanska, Maria
AU - Bouhova-Thacker, Evelina
AU - Walder, James
AU - Grimm, Kathryn
AU - Davidson, Ruth
AU - de Mora, Lee
AU - Dearnaley, William
AU - Henderson, Robert
AU - Barton, Adam
AU - Hughes, Gareth
AU - Long, Robin
AU - Maddocks, Harvey
AU - Price, Darren
AU - Allison, Lee
AU - The ATLAS collaboration
N1 - © 2013 CERN, for the ATLAS Collaboration
PY - 2013/3/4
Y1 - 2013/3/4
N2 - Using 1.8 fb-1 of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Υ(1S,2S,3S) mesons. Υ mesons are reconstructed using the dimuon decay mode. Total production cross sections for pT<70 GeV and in the rapidity interval |yΥ|<2.25 are measured to be, 8.01±0.02±0.36±0.31 nb, 2.05±0.01±0.12±0.08 nb, and 0.92±0.01±0.07±0.04 nb, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for Υ(1S), Υ(2S), and Υ(3S) as a function of Υ transverse momentum pT and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately ±20%. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of Υ meson production, finding that none provide an accurate description of our data over the full range of Υ transverse momenta accessible with this data set.
AB - Using 1.8 fb-1 of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Υ(1S,2S,3S) mesons. Υ mesons are reconstructed using the dimuon decay mode. Total production cross sections for pT<70 GeV and in the rapidity interval |yΥ|<2.25 are measured to be, 8.01±0.02±0.36±0.31 nb, 2.05±0.01±0.12±0.08 nb, and 0.92±0.01±0.07±0.04 nb, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for Υ(1S), Υ(2S), and Υ(3S) as a function of Υ transverse momentum pT and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately ±20%. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of Υ meson production, finding that none provide an accurate description of our data over the full range of Υ transverse momenta accessible with this data set.
U2 - 10.1103/PhysRevD.87.052004
DO - 10.1103/PhysRevD.87.052004
M3 - Journal article
VL - 87
JO - Physical Review D – Particles and Fields
JF - Physical Review D – Particles and Fields
SN - 1550-2368
IS - 5
M1 - 052004
ER -