Measurement of prompt J/psi and beauty hadron production cross sections at mid-rapidity in pp collisions at root s=7 TeV

Abstract

Abstract: The ALICE experiment at the LHC has studied J/ψ production at midrapidity in pp collisions at √ s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity Lint = 5.6 nb−1.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 σprompt J/ψ (pt > 1.3 GeV/c, |y| < 0.9) = 8.3±0.8 (stat.) ± 1.1 (syst.) +1.5 −1.4 (syst.pol.) µb.The cross section for the production of b-hadrons decaying to J/ψ with pt > 1.3 GeV/c and |y| < 0.9 is σJ/ψ←hB (pt > 1.3 GeV/c, |y| < 0.9) = 1.46 ± 0.38 (stat.) +0.26 −0.32 (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.