Suppression of high transverse momentum D mesons in central Pb-Pb collisions at root s(NN)=2.76 TeV (original) (raw)

2012, Journal of High Energy Physics

The production of the prompt charm mesons D 0 , D + , D * + , and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the LHC, at a centre-of-mass energy √ s NN = 2.76 TeV per nucleon-nucleon collision. The p t -differential production yields in the range 2 < p t < 16 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 from the cross section measured at √ s = 7 TeV and scaled to √ s = 2.76 TeV. For the three meson species, R AA shows a suppression by a factor 3-4, for transverse momenta larger than 5 GeV/c in the 20% most central collisions. The suppression is reduced for peripheral collisions. * See Appendix A for the list of collaboration members Suppression of high p t D mesons in Pb-Pb collisions at √ s NN = 2.76 TeV 3 Suppression of high p t D mesons in Pb-Pb collisions at √ s NN = 2.76 TeV Suppression of high p t D mesons in Pb-Pb collisions at √ s NN = 2.76 TeV 7 central collisions), aimed at reducing the large combinatorial background.

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