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Measurement of prompt J/ψJ/\psi and beauty hadron production cross sections at mid-rapidity in pppp collisions at s=7\sqrt{s} = 7 TeV

Collaboration
Oct, 2012
24 pages
Published in:
  • JHEP 11 (2012) 065
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2012-132
Experiments:
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Abstract: (arXiv)
The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at sqrt{s}=7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int = 5.6nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p_t>1.3 GeV/c and rapidity |y|<0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the Psi(2S) and Csi_c resonances, is sigma_prompt-J/psi(pt > 1.3 GeV/c, |y| < 0.9) = 8.3 +- 0.8(stat.) +- 1.1(syst.) + 1.5 - 1.4(syst. pol.) micro barn. The cross section for the production of b-hadrons decaying to J/psi with p_t>1.3 GeV/c and |y|<0.9 is sigma_{J/psi<-h_B} = 1.46 +- 0.38(stat.) + 0.26 -0.32(syst.) micro barn. The results are compared to QCD model predictions. The shape of the p_t and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the b-bbar pair total cross section and dsigma/dy at mid-rapidity.
Note:
  • 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)
  • p p: inclusive reaction
  • J/psi(3100): hadroproduction
  • J/psi(3100): direct production
  • J/psi(3100): leptonic decay
  • electron positron: mass spectrum
  • charmonium: decay
  • bottom: pair production
  • channel cross section
  • bottom particle: decay
  • differential cross section: measured
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