Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 84: Accelerators and Instrumentation I

HK 84.7: Talk

Friday, March 20, 2009, 12:30–12:45, H-ZO 80

Particle Identification with the ALICE TPC — •Alexander Kalweit — Institut für Kernphysik TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt

We present a study of the particle identification capabilities of the ALICE Time Projection Chamber (TPC). The particle identification (PID) plays an important role for the overall performance of the experiment. Charged particles traversing the TPC gas lose a certain amount of energy per unit path length depending on their momentum and rest mass. By this, pions, kaons, protons, deuterons, electrons and muons can be identified over a broad momentum range after a precise gain calibration with radioactive Krypton gas. Results from Monte-Carlo studies with PYTHIA-generated events and from the cosmic runs in 2008 show that the PID works according to specifications and that the mean energy loss per unit path length can be described with a parameterization of the Bethe-Bloch curve.