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Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy-Ion Collisions and QCD Phases VII

HK 34.5: Vortrag

Mittwoch, 1. April 2020, 17:45–18:00, J-HS F

Signal for a 1st order phase transition in dilepton spectra — •Florian Seck1, Tetyana Galatyuk1,2, Ayon Mukherjee3,4, Ralf Rapp5, Jan Steinheimer4, and Joachim Stroth2,31TU Darmstadt, Germany — 2GSI, Darmstadt, Germany — 3Goethe-Universität Frankfurt, Germany — 4FIAS, Frankfurt, Germany — 5Texas A&M University, College Station (TX), USA

Due to their penetrating nature dileptons are an excellent tool to study the properties of hot and dense QCD matter created in relativistic heavy-ion collisions. Thermal dilepton emission rates need to be folded with the space-time dynamics of the fireball to calculate the invariant mass spectrum of the excess radiation recorded in heavy-ion experiments. One approach, that has been established to reproduce the measured data in the energy regime of a few GeV, is the coarse-graining of microscopic transport simulations.

In this contribution we present our study on the applicability of ideal relativistic hydrodynamics for the fireball evolution with two different equations of state provided by the Quark-Hadron Chiral Parity Doublet (QχP) model – one with a cross-over and one with a 1st order phase transition. We compare the properties of the resulting invariant mass and transverse momentum spectra for the two cases. We show how and why the dilepton spectra are modified in the presence of a phase transition and discuss the implications for the search of landmarks in the QCD phase diagram via dileptons.

Supported by DFG under CRC TR-211, by the AI grant of SAMSON AG, by the BMBF under the ErUM-Data project, by the U.S. NSF.

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