Measurement of prompt D${}^0$, D${}^{+}$, D${}^{\ast +}$, and D${}_s^{+}$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The measurement of the production of prompt D${}^0$, D${}^{+}$, D${}^{\ast +}$, and D${}_s^{+}$ mesons in proton$-$lead (p$-$Pb) collisions at the centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, with an integrated luminosity of $292\pm 11$ $\mu$b${}^{-1}$, are reported. Differential production cross sections are measured at mid-rapidity ($-0.96<y_{\mathrm{cms}}<0.04$) as a function of transverse momentum ($p_{\mathrm{T}}$) in the intervals $0<p_{\mathrm{T}}<36$ GeV/$c$ for D${}^0$, $1<p_{\mathrm{T}}<36$ GeV/$c$ for D${}^{+}$ and D${}^{\ast +}$, and $2<p_{\mathrm{T}}<24$ GeV/$c$ for D${}_s^{+}$ mesons. For each species, the nuclear modification factor $R_{\mathrm{pPb}}$ is calculated as a function of $p_{\mathrm{T}}$ using a proton-proton (pp) reference measured at the same collision energy. The results are compatible with unity in the whole $p_{\mathrm{T}}$ range. The average of the non-strange D mesons $R_{\mathrm{pPb}}$ is compared with theoretical model predictions that include initial-state effects and parton transport model predictions. The $p_{\mathrm{T}}$ dependence of the D${}^0$, D${}^{+}$, and D${}^{\ast +}$ nuclear modification factors is also reported in the interval $1<p_{\mathrm{T}}<36$ GeV/$c$ as a function of the collision centrality, and the central-to-peripheral ratios are computed from the D-meson yields measured in different centrality classes. The results are further compared with charged-particle measurements and a similar trend is observed in all the centrality classes. The ratios of the $p_{\mathrm{T}}$-differential cross sections of D${}^0$, D${}^{+}$, D${}^{\ast +}$, and D${}_s^{+}$ mesons are also reported. The D${}_s^{+}$ and D${}^{+}$ yields are compared as a function of the charged-particle multiplicity for several $p_{\mathrm{T}}$ intervals. No modification in the relative abundances of the four species is observed with respect to pp collisions within the statistical and systematic uncertainties.

38 pages, 16 captioned figures, 2 tables, authors from page 33, published version, figures at http://alice-publications.web.cern.ch/node/5356

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