Preliminary Physics Summary: Measurement of prompt $D^0$, $D^+$, $D^{*+}$ and $D_s^+$ production in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

We report preliminary measurements of the production of prompt $D^0$, $D^+$, $D^{*+}$ and $D_s^+$ mesons in p-Pb collisions at the centre-of-mass energy $\sqrt{s_{\rm NN}}=5.02$ TeV per nucleon-nucleon collision. The production yields are measured at mid-rapidity ($-$0.96$<$$y_{\rm cms}$$<$0.04) as a function of transverse momentum ($p_{\rm T}$) in the intervals 0$<$$p_{\rm T}$$<$36 GeV/$c$ for $D^0$, 1$<$$p_{\rm T}$$<$36 GeV/$c$ for $D^+$ and $D^{*+}$, and 2$<$$p_{\rm T}$$<$24 GeV/$c$ for $D_s^+$ mesons. The fraction of prompt D mesons is measured using fits to the D-meson impact parameter distributions, for $D^0$, $D^+$ and $D^{*+}$ mesons. The nuclear modification factors $R_{\rm pPb}$ are calculated using a proton–proton reference at $\sqrt{s}=5.02$ TeV obtained by scaling the D-meson cross sections measured at $\sqrt{s}=7$ TeV. The $D^0$ nuclear modification factor $Q_{\rm pPb}$ is computed as a function of the collision centrality, as well as the central-to-peripheral ratio $Q_{\rm CP}$.