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Article
Report number arXiv:1205.5880 ; CERN-PH-EP-2012-132 ; CERN-PH-EP-2012-132
Title Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at s = 7 TeV
Preprint titleMeasurement of prompt and non-prompt J/ψ production cross sections at mid-rapidity in pp collisions at s = 7 TeV
Author(s) ALICE Collaboration  Afficher les 965 auteurs
Publication 2012
Imprint 09 May 2012
Number of pages 24
Note Long author list - awaiting processing
Long author list - awaiting processing
The most important modification with respect to v1 is a correction factor that is applied to all cross section values, which comes from the Erratum to 'K. Aamodt et al. (ALICE Collaboration), Rapidity and transverse momentum dependence of inclusive J/psi production in pp collisions at sqrt{s}=7 TeV. Phys. Lett. B 704, 442 (2011)
In: JHEP 11 (2012) 065
DOI 10.1007/JHEP11(2012)065
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Free keywords flavor physics ; B physics ; experimental results ; J/psi ; pp collisions ; beauty
Abstract The ALICE experiment at the LHC has studied J/ψ production at mid-rapidity in pp collisions at s=7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity Lint = 5.6 nb1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ψ candidates with transverse momentum pt > 1.3 GeV/c and rapidity |y|<0.9. The cross section for prompt J/ψ mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and χc resonances, is σpromptJ/ψ(pt>1.3GeV/c,|y|<0.9)=7.2±0.7(stat.)±1.0(syst.)1.2+1.3(syst.,pol.)μb. The pt-differential cross section for prompt J/ψ has also been measured. The cross section for the production of b-hadrons decaying to J/ψ with transverse momentum greater than 1.3 GeV/c in the rapidity range |y|<0.9 is σJ/ψ<hB=1.26+0.33(stat.)0.28+0.23(syst.)μb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb¯ pair total cross section and dσ/dy at mid-rapidity.
Copyright/License publication: © 2012-2025 CERN (License: CC-BY-3.0)
preprint: © 2012-2025 CERN (License: Open Access)



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Email contact: h.oeschler@gsi.de


 Notice créée le 2012-05-09, modifiée le 2025-01-14


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