Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Heavy Ion Collisions and QCD Phases VIII

HK 47.1: Group Report

Thursday, March 1, 2018, 14:00–14:30, HZO 80

Transverse momentum distributions of charged particles in pp and nuclear collisions with ALICE at the LHC — •Edgar Perez Lezama for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

The charged-particle transverse momentum spectrum in pp collisions is an important observable for testing pQCD (perturbative QCD) calculations and serves as a reference for pPb, Pb-Pb and Xe-Xe collisions to study the initial state effects and the properties of deconfined matter created in nucleus-nucleus collisions. The study of inclusive charged particle spectra gives information on parton energy loss in the medium created in AA collisions, leading to a suppression of hadron production at high transverse momentum (p_T). This effect can be investigated by calculating the nuclear modification factor (R_AA), defined as the ratio between the p_T spectrum measured in nucleus-nucleus collisions and a reference spectrum in pp collisions scaled by the number of binary collisions. ALICE measured pp collisions in a large energy range √s = 13TeV, 7TeV, 5.02TeV and 2.76TeV, p-Pb at 5.02TeV, Xe-Xe at 5.44TeV and Pb-Pb at 2.76TeV and 5.02TeV. We discuss the p_T spectra in pp and nuclear collisions as well as the nuclear modification factors, which are compared to theoretical models.