Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Heavy Ion Collisions and QCD Phases I
HK 2.1: Group Report
Monday, March 27, 2017, 16:45–17:15, F 1
Transverse momentum distributions of charged particles in pp and Pb–Pb collisions with ALICE at the LHC — •Julius Gronefeld for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — Institut für Kernphysik, Technische Universität Darmstadt
ALICE is an experiment dedicated to the study of heavy-ion collisions at the LHC, with the aim of understanding the physics of the hot and dense deconfined medium produced such in collisions. Since the start of its second phase of running the LHC is delivering collision of protons and lead ions at the top energy of √s = 13 TeV for pp and √sNN = 5.02 TeV for Pb–Pb collisions.
The study of inclusive charged particle spectra sheds light on parton energy loss in the medium leading to a suppression of hadron production at high transverse momentum (pT). A common way to investigate this effect is the determination of the nuclear modification factor (RAA) given by the ratio between a given pT spectrum and a reference spectrum in pp collisions scaled by the number of binary collisions.
In this talk achievements in the analysis of transverse momentum distributions with ALICE are presented. A significant reduction of systematic uncertainties was achieved and furthermore newly developed techniques were applied to the analysis of data at √sNN = 2.76 TeV taken in 2010. Spectra and RAA will be shown in dependence of centrality. In addition the results will be compared to current models.