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Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation und Anwendungen II

HK 26.8: Talk

Tuesday, March 11, 2008, 13:00–13:15, 2D

Electron/Pion Separation in the ALICE TRDAlexander Wilk1 and •Alexandru Bercuci21Institut für Kernphysik, Münster — 2Gesellschaft für Schwerionenforschung, Darmstadt

The identification of electrons with momenta > 1 GeV/c is one of the most important features of the ALICE Transition Radiation Detector (TRD). In 2007 a complete TRD supermodule was used for the first time for measurements in a beam of pions and electrons at the CERN PS.

A major goal of these measurements was to obtain runs with very high statistics (some 100k events) and a good independent electron/pion discrimination. These runs are used to extract reference data to be used for the electron/hadron identification procedures for physics data in ALICE, such as the 2-d likelihood method or an approach using artificial neural networks. In this talk we present the results of the pion suppression for momenta from 1 to 6 GeV/c as well as a comparison to results from simulations.

This work is supported by BMBF.

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