Prompt and non-prompt J/ψ production cross sections at midrapidity in proton-proton collisions at sqrt{mathrm{s}} = 5.02 and 13 TeV

Abstract

The production of J/ψ is measured at midrapidity (|y| < 0.9) in proton-proton collisions at sqrt{s} = 5.02 and 13 TeV, through the dielectron decay channel, using the ALICE detector at the Large Hadron Collider. The data sets used for the analyses correspond to integrated luminosities of mathcal{L} int = 19.4 ± 0.4 nb−1 and mathcal{L} int = 32.2 ± 0.5 nb−1 at sqrt{s} = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/ψ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum pT = 2 GeV/c (1 GeV/c) at sqrt{s} = 5.02 TeV (13 TeV). The pT and rapidity (y) differential cross sections, as well as the corresponding values integrated over pT and y, are carried out separately for prompt and non-prompt J/ψ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the pT and y distributions of beauty quarks predicted by state-of-the-art perturbative QCD models are used to extrapolate an estimate of the mathrm{b}overline{mathrm{b}} pair cross section at midrapidity and in the total phase space. The total mathrm{b}overline{mathrm{b}} cross sections are found to be {sigma}_{mathrm{b}overline{mathrm{b}}} = 541 ± 45 (stat.) ± 69 {left(mathrm{syst}.right)}_{-12}^{+10} (extr.) μb and {sigma}_{mathrm{b}overline{mathrm{b}}} = 218±37 (stat.)±31 {left(mathrm{syst}.right)}_{-9.1}^{+8.2} (extr.) μb at sqrt{s} = 13 and 5.02 TeV, respectively. The value obtained from the combination of ALICE and LHCb measurements in pp collisions at sqrt{s} = 13 TeV is also provided.