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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 (pT). This effect can be investigated by calculating the nuclear modification factor (RAA), defined as the ratio between the pT 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 pT spectra in pp and nuclear collisions as well as the nuclear modification factors, which are compared to theoretical models.

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