Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Poster - Schwerionenkollisionen und QCD Phasen
HK 55.3: Poster
Mittwoch, 6. März 2013, 16:45–19:00, HSZ 3.OG
How I found high momentum leptons in HADES — •Szymon Harabasz1,2, Tetyana Galatyuk1, and Piotr Salabura2 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2Jagiellonian University, Cracow, Poland
The High Acceptance Di-Electron Spectrometer experiment, installed at GSI, Darmstadt, has measured rare penetrating probes and strange particles production in elementary nucleon-nucleon as well as in heavy-ion collisions. In recent years, an upgrade of the data acquisition system was carried out and a major improvement of the spectrometer in terms of granularity and particle identification capability has been made by replacing the TOFino detector with the new Resistive Plate Chamber (RPC) time-of-flight wall. Thanks to this, the heaviest system, Au+Au at a beam kinetic energy of 1.23 GeV/u has been measured by HADES in April - May 2012.
In such collisions, extracting a pure sample of very rare di-electrons radiated from a dense fireball plays a crucial role. Therefore, a careful electron identification is necessary. This can be achieved by exploring not only information from the Ring Imaging Cherenkov detector but also from the time-of-flight measurement in combination with an evidence of an electromagnetic shower formation.
In this contribution we present results on efficiency and purity of electron identification obtained from the combined information provided by the RPC and the electromagnetic shower detector.
Supported by BMBF (06FY9100I and 06FY7114), HIC for FAIR, EMMI, GSI and HGS-HIRe.