Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Schwerionenkollisionen und QCD Phasen IV

HK 41.4: Talk

Thursday, March 18, 2010, 15:00–15:15, HG I

Electron identification capabilities of the CBM experiment at FAIR — Claudia Höhne¹, Ivan Kisel¹, •Semen Lebedev^1,2, and Gennady Ososkov² — ¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — ²Laboratory of Information Technologies, Joint Institute for Nuclear Research, Dubna, Russia

The Compressed Baryonic Matter (CBM) experiment at the future FAIR facility at Darmstadt will measure dileptons emitted from the hot and dense phase in heavy-ion collisions. In case of an electron measurement, a high purity of identified electrons is required in order to suppress the background. Electron identification in CBM will be performed by a RICH and TRD detectors.

In this contribution, methods which have been developed for the electron identification in CBM will be presented. A fast and efficient RICH ring recognition algorithm based on the Hough Transform has been implemented. An ellipse fitting algorithm has been elaborated because most of the CBM RICH rings have elliptic shapes. An Artificial Neural Network can be used in order to suppress fake rings. The electron identification in RICH is substantially improved by the use of TRD detectors for which several different algorithms for electron identification are implemented. Results of electron identification and pion suppression are presented.