CERN Accelerating science

Article
Report number arXiv:1106.5325 ; CERN-PH-EP-2011-083 ; CERN-PH-EP-2011-083
Title Measurement of the Υ(1S)Υ(1S) Production Cross-Section in pp Collisions at ss = 7 TeV in ATLAS
Related titleMeasurement of the Upsilon(1S) Production Cross-Section in pp Collisions at sqrt(s) = 7 TeV in ATLAS
Author(s) ATLAS Collaboration  Mostra tots els 3027 autors
Publication 2013-07-16
Imprint 01 Jul 2011
Number of pages 19
Note Comments: 10 pages plus author list (25 pages total), 8 figures, 1 table, to be submitted to Phys Lett. B
10 pages plus author list (24 pages total), 3 figures, 1 table, final version as appears in Physics Letters B
In: Phys. Lett. B 705 (2011) 9-27
DOI 10.1016/j.physletb.2011.09.092
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Abstract A measurement of the cross-section for Upsilon(1S) -> mu+mu- production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the Upsilon(1S) transverse momentum in two bins of rapidity, |y(Upsilon1S)| < 1.2 and 1.2 < |y(Upsilon1S)| < 2.4. The measurement requires that both muons have transverse momentum pT(mu) > 4 GeV and pseudorapidity |eta(mu)| < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb-1, collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.
Copyright/License publication: © 2011-2024 CERN (License: Open Access)
preprint: © 2011-2024 CERN (License: CC-BY-3.0)



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Email contact: klaus.moenig@cern.ch


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