Measurement of the non-prompt D-meson fraction as a function of multiplicity in proton$-$proton collisions at $\sqrt{s}=13$ TeV

Abstract

The fractions of non-prompt (i.e. originating from beauty-hadron decays) D${}^0$ and D${}^{+}$ mesons with respect to the inclusive yield are measured as a function of the charged-particle multiplicity in proton$-$proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV with the ALICE detector at the LHC. The results are reported in intervals of transverse momentum ($p_{\mathrm{T}}$) and integrated in the range $1<p_{\mathrm{T}}<24$ GeV/$c$. The fraction of non-prompt D${}^0$ and D${}^{+}$ mesons is found to increase slightly as a function of $p_{\mathrm{T}}$ in all the measured multiplicity intervals, while no significant dependence on the charged-particle multiplicity is observed. In order to investigate the production and hadronisation mechanisms of charm and beauty quarks, the results are compared to PYTHIA 8 as well as EPOS 3 and EPOS 4 Monte Carlo simulations, and to calculations based on the colour glass condensate including three-pomeron fusion.

arXiv comment28 pages, 8 captioned figures, 2 tables, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/9069

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