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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VII
HK 34.1: Gruppenbericht
Mittwoch, 1. April 2020, 16:30–17:00, J-HS F
Low-Mass Dielectron Measurements in pp, p-Pb and Pb-Pb Collisions with ALICE — •Jerome Jung for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
Low-mass dielectrons present an exceptional tool to deepen our understanding of the Quark-Gluon Plasma (QGP) created in the collision of ultra-relativistic heavy-ions, since they are produced at all stages of the collision while being unaffected by the strong interaction. To single out the interesting signal characteristics of the QGP, the primordial e+e−-pair production in vacuum has to be understood first. Therefore, measurements in pp collisions serve as a medium-free baseline while the measurements in p-Pb collisions help to separate cold nuclear matter effects from those of the hot and dense medium.
In this talk, recent results of the dielectron measurements from the ALICE experiment will be presented. For the first time, dielectron production is studied via a consistent system scan of pp, p-Pb and Pb-Pb collisions at √sNN=5 TeV displaying medium modifications as a function of invariant mass and pair transverse momentum. Finally, super-soft dielectron production is discussed comparing the measurement of pp collisions at √s=13 TeV using a low-magnetic field setup with expectations from known hadronic sources to address the long-standing question of a possible soft-dilepton excess in pp collision at LHC energies.
Supported by BMBF and the Helmholtz Association.