Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Schwerionenkollisionen und QCD Phasen III
HK 15.5: Vortrag
Dienstag, 22. März 2011, 15:15–15:30, HS AP
Dielectron production in Au+Au collisions at √sNN=39 GeV at STAR — •Patrick Huck — Lawrence Berkeley National Laboratory, Berkeley, California 94720 — Physik Dept. E12, Technische Universität München, 85748 Garching, Deutschland
During a beam energy scan in 2010 a wide range of beam energies has
been explored for Au+Au collisions using the STAR detector at RHIC. With minimum
material budget in the tracking part of the detector this run is particularly
suited for the investigation of virtual photons originating from the hot and
dense medium created in heavy ion collisions. The completed installation of the
STAR time-of-flight detector is a further distinctive feature which
allows the particles’ velocity to be used for particle identification in
addition to their energy loss in the time projection chamber.
As electromagnetic probes, dielectron pairs do not interact strongly
with the medium and hence carry direct information of its properties at the time
of production. Thus, measurements of dielectron emissivity in heavy ion
collisions provide an additional tool for the study of the quark gluon
plasma.
For a center-of-mass energy of √sNN=39 GeV,
170 M events have been taken. The talk presents the status of an
ongoing dielectron analysis of this high statistics sample. It concentrates on
particle
identification, background rejection and subtraction, and the reconstruction of
dielectron pairs up to Minvee=3.5 GeV/c2.
This work is supported by a “Doktorandenkurzstipendium” granted to the speaker by the German Academic Exchange Service.