CERN Accelerating science

Article
Report number arXiv:1202.6579 ; CERN-PH-EP-2012-051 ; LHCB-PAPER-2011-036 ; CERN-PH-EP-2012-051 ; LHCB-PAPER-2011-036
Title Measurement of Υ production in pp collisions at s=7 TeV
Author(s) LHCb Collaboration  Mostra tots els 596 autors
Affiliation (CERN)
Publication 2012-06-07
Imprint 01 Mar 2012
Number of pages 22
Note Comments: 22 pages, 7 figures
In: Eur. Phys. J. C 72 (2012) 2025
DOI 10.1140/epjc/s10052-012-2025-y
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; QCD ; quarkonium ; spectroscopy ; heavy quark production ; particle and resonance production ; experimental results
Abstract The production of Upsilon(1S), Upsilon(2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy of sqrt(s)=7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb-1 collected at the Large Hadron Collider. The Upsilon mesons are reconstructed in the decay mode Upsilon -> mu+ mu- and the signal yields are extracted from a fit to the mu+ mu- invariant mass distributions. The differential production cross-sections times dimuon branching fractions are measured as a function of the Upsilon transverse momentum pT and rapidity y, over the range pT < 15 GeV/c and 2.0 < y < 4.5. The cross-sections times branching fractions, integrated over these kinematic ranges, are measured to be sigma(pp -> Upsilon(1S) X) x B(Upsilon(1S)->mu+ mu-) = 2.29 {\pm} 0.01 {\pm} 0.10 -0.37 +0.19 nb, sigma(pp -> Upsilon(2S) X) x B(Upsilon(2S)->mu+ mu-) = 0.562 {\pm} 0.007 {\pm} 0.023 -0.092 +0.048 nb, sigma(pp -> Upsilon(3S) X) x B(Upsilon(3S)->mu+ mu-) = 0.283 {\pm} 0.005 {\pm} 0.012 -0.048 +0.025 nb, where the first uncertainty is statistical, the second systematic and the third is due to the unknown polarisation of the three Upsilon states.
Copyright/License preprint: © 2012-2024 CERN (License: CC-BY-3.0)
publication: © 2012-2024 CERN (License: CC-BY-3.0)



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