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Transverse momentum dependence of D-meson production in Pb-Pb collisions at √sNN=2.76 TeV

The production of prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, √sNN, of 2.76 TeV. The production yields for rapidity |y|< 0.5 are presented as a function of transverse momentum, pT, in the interval 1- 36 GeV/c for the centrality class 0-10% and in the interval 1-16 GeV/c for the centrality class 30- 50%. The nuclear modification factor RAA was computed using a proton-proton reference at √s=2.76 TeV, based on measurements at √s=7 TeV and on theoretical calculations. A maximum suppression by a factor of 5-6 with respect to binary-scaled pp yields is observed for the most central collisions at pT of about 10 GeV/c. A suppression by a factor of about 2- 3 persists at the highest pT covered by the measurements. At low pT (1-3 GeV/c), the RAA has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all pT intervals, the RAA is larger in the 30-50% centrality class compared to central collisions. The D-meson RAA is also compared with that of charged pions and, at large pT, charged hadrons, and with model calculations.

transverse momentum ; D-meson ; lead-lead

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