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

Abstract

The production of J/$\psi$ 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 ${\mathcal{L}}_{\mathrm{int}}$ = 19.4 $\pm$ 0.4 nb${}^{-1}$ and ${\mathcal{L}}_{\mathrm{int}}$ = 32.2 $\pm$ 0.5 nb${}^{-1}$ at $\sqrt{s}$ = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/$\psi$ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum $p_{\mathrm{T}}$ = 2 GeV/$c$ (1 GeV/$c$) at $\sqrt{s}$ = 5.02 TeV (13 TeV). The $p_{\mathrm{T}}$ and rapidity ($y$) differential cross sections, as well as the corresponding values integrated over $p_{\mathrm{T}}$ and $y$, are carried out separately for prompt and non-prompt J/$\psi$ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the $p_{\mathrm{T}}$ 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 ${\sigma }_{\mathrm{b}\overline{\mathrm{b}}}=541\pm 45(stat.)\pm 69(syst.{)}_{-12}^{+10}(extr.)\mu \mathrm{b}$ and ${\sigma }_{\mathrm{b}\overline{\mathrm{b}}}=218\pm 37(stat.)\pm 31(syst.{)}_{-9.1}^{+8.2}(extr.)\mu \mathrm{b}$ 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.

arXiv comment31 pages, 6 captioned figures, 2 tables, authors from page 25, published version, figures at http://alice-publications.web.cern.ch/node/7315

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