Measurement of D-meson production versus multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC is reported. D${}^0$, D${}^{+}$ and D${}^{\ast +}$ mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range $-0.96<y_{\mathrm{cms}}<0.04$ and transverse momentum interval $1<p_{\mathrm{T}}<24$ GeV/$c$. The multiplicity dependence of D-meson production is examined by either comparing yields in p-Pb collisions in different event classes, selected based on the multiplicity of produced particles or zero-degree energy, with those in pp collisions, scaled by the number of binary nucleon-nucleon collisions (nuclear modification factor); as well as by evaluating the per-event yields in p-Pb collisions in different multiplicity intervals normalised to the multiplicity-integrated ones (relative yields). The nuclear modification factors for D${}^0$, D${}^{+}$ and D${}^{\ast +}$ are consistent with one another. The D-meson nuclear modification factors as a function of the zero-degree energy are consistent with unity within uncertainties in the measured $p_{\mathrm{T}}$ regions and event classes. The relative D-meson yields, calculated in various $p_{\mathrm{T}}$ intervals, increase as a function of the charged-particle multiplicity. The results are compared with the equivalent pp measurements at $\sqrt{s}=7$ TeV as well as with EPOS~3 calculations.

39 pages, 11 captioned figures, 8 tables (5 of them in Appendix A), authors from page 33, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2359

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