Suppression of high transverse momentum D mesons in central Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV

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2.76 TeV
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The production of the prompt charm mesons D0, D+ and D* was measured with the ALICE detector in Pb--Pb collisions at the LHC, at a centre-of-mass energy sqrt(s_NN)=2.76 TeV per nucleon--nucleon collision. The pt-differential production yields in 2<16 (24 for D*) GeV/c at central rapidity, |y|<0.5, were used to calculate the nuclear modification factor R_AA with respect to a proton--proton reference obtained by scaling to sqrt(s)=2.76 TeV the cross section measured at sqrt(s)=7 TeV. For the three meson species, in the centrality class corresponding to the 20% most central collisions, R_AA shows a suppression of a factor 3--4 with respect to unity, for transverse momenta larger than 5 Gev/c. The suppression is reduced when going to peripheral collisions.