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

Abstract

The $p_{\mathrm{T}}$-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 $\sqrt{s}=5.02\mathrm{TeV}$. The data sample used in the analysis corresponds to an integrated luminosity of $(19.3\pm 0.4)\mathrm{n}{\mathrm{b}}^{-1}$. D mesons were reconstructed from their decays ${\mathrm{D}}^0\to {\mathrm{K}}^{-}{\pi }^{+}$, ${\mathrm{D}}^{+}\to {\mathrm{K}}^{-}{\pi }^{+}{\pi }^{+}$, and ${\mathrm{D}}_{\mathrm{s}}^{+}\to \varphi {\pi }^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\pi }^{+}$ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt ${\mathrm{D}}^{+}$ and ${\mathrm{D}}_{\mathrm{s}}^{+}$ mesons have an extended $p_{\mathrm{T}}$ coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on $p_{\mathrm{T}}$, allowing for a more precise determination of their $p_{\mathrm{T}}$-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, $f_{\mathrm{s}}/(f_{\mathrm{u}}+f_{\mathrm{d}})$, 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 $\mathrm{d}{\sigma }_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y{|}_{|y|<0.5}=34.5\pm 2.4(stat.{)}_{-2.9}^{+4.7}(tot.syst.)\mu \mathrm{b}$. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section predicted by perturbative QCD calculations.

arXiv comment36 pages, 13 captioned figures, 5 tables, authors from page 31, published version, figures at http://alice-publications.web.cern.ch/node/6833

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