Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VII
HK 34.7: Talk
Wednesday, April 1, 2020, 18:15–18:30, J-HS F
Simulations of thermal dielectrons for the CBM experiment — •Etienne Bechtel for the CBM collaboration — Goethe University Frankfurt , IKF
The Compressed Baryonic Matter (CBM) experiment will access a wide range of physics observables for heavy-ion collisions in the region of highest net- baryon densities. One of the important topics of its physics program is the study of rare dilepton channels, which were not precisely measured before with other experiments in this energy range. The spontaneously broken chiral symmetry of the vacuum is assumed to be restored at finite temperatures and net-baryon densities and should be accessible in heavy-ion collisions. A precision measurement of the ρ-meson and its chiral partner, the a1-meson, would be sensible to this restoration. On the other hand, the measurement of direct thermal photons from the early stages of the fireball evolution provides information about the temperature of the emitting source and its excitation function and could provide hints for a potential first order phase transition. This talk will cover the newest results on the simulation of different dielectron channels, including the measurement of the thermal radiation of the fireball itself, as well as newly added machine learning techniques in the analysis chain. This work is supported by BMBF.