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 2.7: Talk

Monday, March 27, 2017, 18:30–18:45, F 1

Studies of Isolated Photon Production in pp Collisions with ALICE — •Rene Schach — Institut für Kernphysik, Goethe Universität Frankfurt

Isolated photons at high transverse momenta are produced in hard-scattering processes in high-energy pp and heavy-ion collisions. Photon production in heavy-ion collisions is thought to scale by the underlying number of binary collisions times photo-production in pp collisions. Therefore the comparison of results from pp collisions to results from p-Pb and heavy-ion collisions functions as a test for these scaling properties and helps to interpret the isolated-photon spectra in p-Pb and heavy-ion collisions at the LHC.

Since isolated photons originate directly in parton-parton interactions, their measurement may also give insights to possible modifications of nuclear PDFs.

After a description of the analysis technique, the status of the isolated-photon measurement in pp collisions with the ALICE EMCAL will be presented. The cross sections of isolated photons for different collision energies and necessary corrections will be discussed.

Supported by BMBF and the Helmholtz Association.