Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Heavy Ion Collisions and QCD Phases IX

HK 40.8: Vortrag

Donnerstag, 30. März 2017, 15:45–16:00, F 3

Photon Production in a Hadronic Transport Approach — •Anna Schäfer1,2, Niklas Ehlert2, Juan M. Torres-Rincon1, and Hannah Petersen1,2,31Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany — 2Institut für Theoretische Physik, Goethe-Universität, D-60438 Frankfurt am Main, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany

Photons play an important role in the investigation and understanding of the QGP. Unlike hadrons, which are likely to interact with the medium before detection, photons only interact electromagnetically, their mean free path is much larger than the size of the system. They are direct probes of the observed medium and offer unique insights into the fireball and the hadronic phase. Additionally, measurements at RHIC and LHC show unexpectedly large momentum anisotropies for photons presumably produced in the hadronic phase of heavy ion collisions. Further investigation of photons in a strongly-interacting medium is hence necessary to solve the direct photon flow puzzle.
To improve the theoretical understanding of photons at low energies in heavy ion reactions, scattering processes involving photons have been implemented into a hadronic transport approach (SMASH), which simulates hot and dense strongly-interacting nuclear matter. Comparisons of the obtained thermal rates in infinite matter calculations to the ones used in hydrodynamic calculations will be shown. The plan for the future is to apply this hadronic transport approach within a hybrid approach to RHIC/LHC energies.

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