München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Heavy-Ion Collisions and QCD Phases IX
HK 48.5: Vortrag
Donnerstag, 21. März 2019, 15:15–15:30, HS 15
Dielectron production in Pb–Pb collisions at √sNN = 5.02 TeV with ALICE — •Carsten Klein — Institut für Kernphysik, Goethe-Universität Frankfurt
Electron-positron pairs are an excellent probe to investigate the properties of the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. Because they are produced at all stages of the collision and do not interact strongly with the medium, their spectra reflect the entire space-time evolution of the system. At low invariant mass, the dielectron production is sensitive to the properties of vector mesons in the dense medium which is related to the predicted restoration of chiral symmetry. In the intermediate-mass region, the dielectron continuum gives further insight into the heavy-quark energy loss in the QGP via the measurement of correlated electron-positron pairs from charm- and beauty-hadron decays.
In this talk, preliminary results of the dielectron production in Pb–Pb collisions at √sNN = 5.02 TeV with ALICE will be presented. For the first time in heavy-ion collisions, a hint for a suppression of the heavy-flavour production in comparison to the Ncoll-scaled vacuum expectations is observed. Finally, the status of the measurement of virtual direct photons will be discussed.
Supported by BMBF