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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy-Ion Collisions and QCD Phases VI

HK 34.1: Gruppenbericht

Mittwoch, 20. März 2019, 14:00–14:30, HS 15

Overview of neutral meson and direct photon production at the LHC measured with ALICE. Energy and system size dependence. — •Ana Marin for the ALICE collaboration — GSI Helmholtzzentrum für Schewerionenforschung, Planckstr. 1, 64291 Darmstadt

The ALICE experiment is dedicated to the study of the Quark-Gluon Plasma (QGP) formed in heavy-ion collisions. Among other observables, the properties of the QGP can be addressed by studying neutral meson and direct photon production in nucleus-nucleus collisions. Direct photons provide information about the initial stage of the collision as well as the space-time evolution of the QCD medium. In particular, the thermal photon spectrum and flow carry information about the temperature and development of collective flow in hot medium. Measurements of neutral meson production in different kinds of collision are interesting for many reasons: in pp collisions they serve as reference spectra, as well as a test of pQCD predictions and other theoretical model calculations; in p-Pb collisions cold nuclear matter effects are measured; in AA collisions neutral meson spectra give insights on the energy loss of partons traversing the hot and dense medium.

In this talk, an overview of neutral meson production as well as direct photon production and flow in pp, p-Pb and AA collisions at energies provided by the LHC and measured with ALICE will be presented.