Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Schwerionenkollisionen und QCD Phasen

HK 39.1: Gruppenbericht

Dienstag, 5. März 2013, 16:45–17:15, HSZ-201

Transverse Momentum Spectra of Charged Particles measured in pp, p-Pb and Pb-Pb Collisions with ALICE at the LHC — •Michael Linus Knichel — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany

Particle production in pp collisions at high p_T is governed by hard parton-parton scatterings described by pQCD. In heavy-ion collisions the suppression of particle production at high p_T is attributed to the energy loss of partons propagating in the hot and dense QCD medium. The study of proton-nucleus collisions, where no QCD medium is created, provides a reference for Pb-Pb and allows the investigation of the so-called cold-nuclear-matter effects. We present results on charged particle production in the central pseudorapidity region for transverse momenta up to 50 GeV/c. Transverse momentum spectra measured in Pb-Pb and p-Pb collisions are compared to that from pp in terms of the nuclear modification factors. Comparison of the p_T-spectra and nuclear modification factors with other measurements and model calculations will be discussed.