Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Heavy Ion Collisions and QCD Phases VIII
HK 47.1: Gruppenbericht
Donnerstag, 1. März 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.