Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Heavy Ion Collision and QCD Phases III
HK 10.1: Gruppenbericht
Montag, 14. März 2016, 16:30–17:00, S1/01 A01
Low-Mass Dielectron Measurements in pp, p-Pb and Pb-Pb Collisions with ALICE — •Carsten Klein for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
Electron-positron (dielectron) pairs are an excellent experimental probe to investigate the properties of the quark-gluon plasma which is formed during ultrarelativistic heavy-ion collions. Because they do not interact strongly their spectra reflect the entire space-time-evolution of the collision. The created medium can lead to a modification of the dielectron production with respect to the vacuum rate. 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 contribution, recent dielectron measurements in the central barrel of ALICE are presented. The dielectron invariant mass and pair transverse momentum distributions will be compared to those from expected hadronic sources in pp collisions at √s = 7 TeV and in p-Pb collisions at √sNN = 5.02 TeV. From those distributions we discuss also constraints on the heavy-flavour production. The status of the analysis of Pb-Pb collisions at √sNN = 2.76 TeV and an outlook to measurements at √sNN = 5.02 TeV will also be presented.
Supported by BMBF and the Helmholtz Association.