Measurement of upsilon production in 7 TeV pp collisions at ATLAS

Jones, Roger and Chilingarov, Alexandre and Kartvelishvili, Vakhtang and Love, Peter and Borissov, Guennadi and Fox, Harald and Smizanska, Maria and Bouhova-Thacker, Evelina and Walder, James and Grimm, Kathryn and Davidson, Ruth and de Mora, Lee and Dearnaley, William and Henderson, Robert and Barton, Adam and Hughes, Gareth and Long, Robin and Maddocks, Harvey and Price, Darren and Allison, Lee (2013) Measurement of upsilon production in 7 TeV pp collisions at ATLAS. Physical Review D – Particles and Fields, 87 (5). ISSN 1550-2368

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D – Particles and Fields
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© 2013 CERN, for the ATLAS Collaboration
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Deposited On:
04 Jun 2013 08:54
Last Modified:
06 Jun 2020 02:41