Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 60: Schwerionenkollisionen und QCD Phasen
HK 60.2: Vortrag
Freitag, 23. März 2012, 11:15–11:30, P 5
Charged particle production at large transverse momentum in Pb-Pb collisions at √s=2.76 TeV measured with ALICE at the LHC — •Michael Linus Knichel — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
The suppression of high-pT particle production in heavy-ion collisions is generally attributed to energy loss of partons as they propagate in the hot and dense QCD medium. Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at √s=2.76 TeV have been measured by the ALICE Collaboration at the LHC. The measurements in the central pseudorapidity region |η| < 0.8 cover a transverse momentum range of 0.15 < pT < 50 GeV/c. Charged particle spectra in Pb-Pb collisions are compared to those measured in inelastic pp collisions at the same collision energy, scaled by the number of nucleon-nucleon collisions in Pb-Pb. This comparison is expressed in terms of the nuclear modification factor RAA. The evolution of particle spectra and RAA as a function of collision centrality will be presented. RAA as a function of pT will be compared to calculations from different energy loss models.