Inclusive, prompt and non-prompt $\mathrm{J}/\psi$ production at midrapidity in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

A measurement of inclusive, prompt, and non-prompt $\mathrm{J}/\psi$ production in p$-$Pb collisions at a nucleon$-$nucleon centre-of-mass energy $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV is presented. The inclusive $\mathrm{J}/\psi$ mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum $p_{\mathrm{T}}=0$. The inclusive $\mathrm{J}/\psi$ nuclear modification factor $R_{\mathrm{pPb}}$ is calculated by comparing the new results in p$-$Pb collisions to a recently measured proton$-$proton reference at the same centre-of-mass energy. Non-prompt $\mathrm{J}/\psi$ mesons, which originate from the decay of beauty hadrons, are separated from promptly produced $\mathrm{J}/\psi$ on a statistical basis for $p_{\mathrm{T}}$ larger than 1.0 GeV/$c$. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p$-$Pb run, corresponding to an integrated luminosity ${\mathcal{L}}_{\mathrm{int}}=292\pm 11{\mu \mathrm{b}}^{-1}$, which is six times larger than the previous publications. The total uncertainty on the $p_{\mathrm{T}}$-integrated inclusive $\mathrm{J}/\psi$ and non-prompt $\mathrm{J}/\psi$ cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and $R_{\mathrm{pPb}}$ are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt $\mathrm{J}/\psi$ production cross section, the $\mathrm{b}\overline{\mathrm{b}}$ production cross section at midrapidity, $\mathrm{d}{\sigma }_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y$, and the total cross section extrapolated over full phase space, ${\sigma }_{\mathrm{b}\overline{\mathrm{b}}}$, are derived.

arXiv comment31 pages, 8 captioned figures, 3 tables, authors from page 26, published version, figures at http://alice-publications.web.cern.ch/node/7073

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