Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Heavy Ion Collision and QCD Phases X
HK 48.1: Gruppenbericht
Donnerstag, 17. März 2016, 14:00–14:30, S1/01 A01
Charged-particle production in Pb-Pb collisions at the LHC measured with ALICE — •Federica Sozzi for the ALICE collaboration — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
In June 2015 data taking started at the LHC at CERN, with substantially increased collision rates and energies with respect to Run 1. Particle production at collider energies originates from the interplay of perturbative (hard) and non-perturbative (soft) QCD processes. Inclusive charged-particle production in pp collisions has been studied with the new data set collected by the ALICE experiment at √s=13 TeV. In this report the pseudorapidity distributions of primary charged particles are presented, as well as the transverse-momentum distribution and its evolution with the event multiplicity. In Pb-Pb measurements the investigation focuses on the deconfined quark-gluon state. The transverse-momentum spectrum measured in Pb-Pb collisions is compared with a pp minimum-bias reference spectrum measured at the same energy. The comparison is presented here in terms of the so called nuclear modification factor RAA measured at √sNN=5 TeV, the highest collision energy ever achieved in laboratory. The measurements in pp and Pb-Pb collisions are compared with results from Run 1 as well as with predictions from theoretical models.