München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 7: Instrumentation und Anwendungen

HK 7.5: Vortrag

Montag, 20. März 2006, 15:15–15:30, H

Measurement of the Electron/Pion Separation with the ALICE TRD Chambers — •Alexander Wilk — Institut für Kernphysik, Münster, Germany

Clean identification of electrons with a momentum p > 1 GeV/c is one of the most important tasks of the ALICE Transition Radiation Detector (TRD). In 2004 a complete stack of final ALICE TRD chambers has been tested for the first time at CERN. Measurements were carried out using a mixed beam of electrons and pions at momenta from 2 to 10 GeV/c. During a test beam in 2002 with small prototype chambers an improvement of the pion rejection by a factor of about 3 has been reached with a neural network algorithm (NN) compared to a likelihood method based on total deposited charge [1]. We now report on first results of the electron/pion separation using a NN with final ALICE TRD chambers.

This work is supported by BMBF.

[1] C. Adler et. al., Nucl. Instr. Meth. Phys. Res. A 522 (2005) 364.