12-18 August 2012
US/Eastern timezone

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D meson nuclear modification factors in Pb–Pb collisions at 2.76 TeV with the ALICE detector

17 Aug 2012, 14:00
20m
Ambassador ()

Ambassador

Speaker

Alessandro Grelli (University of Utrecht (NL))

Description

The properties of the hot and dense QCD medium formed in ultra-relativistic heavy ion collisions, as well as the mechanism of in-medium partonic energy loss, can be accessed via the measurement of the nuclear modification factor of particle production. The measurement of D meson production provides key tests of parton energy-loss models, which predict that charm quarks should experience less in-medium energy loss than light quarks and gluons. The ALICE experiment has measured the production of prompt D0, D+ and D*+ mesons in pp and Pb-Pb collisions at the LHC at sqrt(s) = 7 and 2.76 TeV and at sqrt(s_{NN}) = 2.76 TeV, respectively, via the exclusive reconstruction of their hadronic decay. The p_t -differential production yields in the range 2 < pt < 16 GeV/c at central rapidity, |y| < 0.5, were used to calculate the nuclear modification factor. A suppression of a factor 3–4 for transverse momenta larger than 5 GeV/c in the 20% most central collisions was observed. The suppression is reduced in peripheral collisions. Preliminary results in an extended p_t -range, using the data sample collected during the 2011 Pb-Pb run, will be shown.

Primary author

Collaboration ALICE (Cern, Geneva, Switzerland)

Co-author

Alessandro Grelli (University of Utrecht (NL))

Presentation Materials

Peer reviewing

Paper