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Measurement of beauty and charm production in pp collisions at \( \sqrt{s} \) = 5.02 TeV via non-prompt and prompt D mesons

A preprint version of the article is available at arXiv.

Abstract

The pT-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (|y| < 0.5) in proton-proton collisions at \( \sqrt{s} \) = 5.02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19.3 ± 0.4) nb1. D mesons were reconstructed from their decays D0 Kπ+, D+ Kπ+π+, and \( {\mathrm{D}}_{\mathrm{s}}^{+}\to \upphi {\uppi}^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\uppi}^{+} \) and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and \( {\mathrm{D}}_{\mathrm{s}}^{+} \) mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The \( \mathrm{b}\overline{\mathrm{b}} \) production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is \( \mathrm{d}{\sigma}_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y\left|{}_{\left|\mathrm{y}\right|<0.5}=34.5\pm 2.4{\left(\mathrm{stat}\right)}_{-2.9}^{+4.7}\left(\mathrm{tot}.\mathrm{syst}\right)\right. \) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.

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