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 = 5.6nb−1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ψ candidates with transverse momentum pt > 1.3GeV/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 (syst. pol.) μb. The cross section for the production of b-hadrons decaying −1.4 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 (syst.) μb. The results are compared to QCD model predictions. The −0.32 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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.