München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Heavy-Ion Collisions and QCD Phases I

HK 4.1: Gruppenbericht

Montag, 18. März 2019, 14:00–14:30, HS 15

Energy and system size dependent charged-particle production measured with ALICE — •Patrick Huhn — IKF, Goethe Universität Frankfurt am Main, Deutschland

The ALICE experiment at the LHC is designed to investigate the properties of the so-called Quark-Gluon Plasma (QGP) by studying high-energy pp, p-Pb, Pb–Pb and recently for the first time Xe–Xe collisions. Such a hot and dense deconfined QCD medium (the QGP) is created in collisions of Pb- or Xe-ions at high center-of-mass energies. High energetic quarks and gluons created in the early phase of the collision traveling through the plasma loose energy (parton energy loss). Such medium effects can be examined by comparing the production of charged particles in heavy-ion collisions with the production in pp collisions where no medium is created. This comparison is usually expressed by means of the nuclear modification factor R_AA, the ratio of the yield in A–A collisions and the yield in pp collisions scaled by the number of binary collisions.
In this talk, we present the analysis of transverse-momentum distributions for primary charged particles as well as the nuclear modification factors in Pb-Pb collisions at √s_NN= 2.76 TeV and 5.02 TeV and in Xe-Xe collisions at √s_NN= 5.44 TeV measured with ALICE. In particular, we focus on a comparison of the nuclear modification factors in Pb-Pb and Xe-Xe collisions to investigate a possible system size and energy dependence of R_AA.