München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Heavy-Ion Collisions and QCD Phases VIII

HK 41.7: Talk

Wednesday, March 20, 2019, 18:15–18:30, HS 15

Feasibility study for the measurement of a photon HBT signal — •Nicole Löher¹, Jürgen Berges², Oscar Garcia², Aleksas Mazeliauskas², and Klaus Reygers¹ — ¹Physikalisches Institut, Universität Heidelberg — ²Institut für Theoretische Physik, Universität Heidelberg

A theoretical study on a possible measurement of Hanbury-Brown Twiss (HBT) correlations of direct photons in nucleus-nucleus collisions is presented. The spatial-temporal evolution of the Quark Gluon Plasma (QGP) at LHC energies (√s_NN=2.74 TeV) is simulated using the hydrodynamic code iEBE-VISHNU. Photon invariant yields are then calculated based on the photon rates from P. Arnold, G. Moore and L. Yaffe for the QGP phase and parameterizations by M. Heffernan, P. Hohler and R. Rapp for the hadron gas phase. The HBT signal for thermal photons is determined. In addition, two extra sources for photons are investigated. An early source based on nonequilibrium Yang-Mills dynamics and a photon enhancement near the critical temperature T_c are discussed. The photon HBT signal is calculated for all three scenarios and the results are compared. Based on these calculations an estimate for the required statistics for a possible measurable signal in the ALICE detector system is given.