Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Schwerionenkollisionen und QCD Phasen
HK 33.3: Vortrag
Mittwoch, 19. März 2014, 17:15–17:30, HZ 6
Measurement of Low-Mass Dielectron Production in Pb–Pb Collisions with ALICE — •Patrick Reichelt for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
The measurement of electron-positron pairs (dielectrons) in the low invariant mass region allows to study the vacuum and in-medium properties of light vector mesons. Additionally, dielectrons from thermal photons are an important probe for the study of the evolution of the hot and dense medium created in heavy-ion collisions. In particular, the extraction of virtual photons in the low-mass region provides a complimentary measurement of the real photon yield. In the ALICE apparatus at the LHC, electrons at mid-rapidity are identified by their specific energy loss in the Inner Tracking System (ITS) and the Time Projection Chamber (TPC), combined with time-of-flight information from TOF. We will present the status of the low-mass dielectron analysis in Pb–Pb collisions at √sNN=2.76 TeV, involving these detector systems. Special emphasis will be laid on the extraction of the virtual photon yield. The invariant mass distribution will be compared to the expected hadronic sources.
Supported by BMBF and the Helmholtz Association.