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Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Poster

HK 49.31: Poster

Thursday, March 15, 2007, 16:00–17:00, P

Particle identification via engergy loss measurement of the HADES multi-wire drift chambers — •Alexander Schmah1,3, Jochen Markert2, Christian Müntz2, and Joachim Stroth1,2 for the HADES collaboration — 1Gesellschaft für Schwerionenforschung (GSI), Darmstadt — 2Johann Wolfgang Goethe Universität Frankfurt am Main — 3Technische Universität Darmstadt

The HADES tracking system consists of 24 trapezoidal, planar 6-layered low-mass multi-wire drift chambers (MDC) symmetrically arranged in six sectors, forming four tracking planes (I-IV) of increasing size. A method has been developed to derive the energy loss deposited in the drift cell from the drift signals Time-over-Threshold ToT. Special attention has to be paid to the unfolding of the dependencies of the ToT from the track topology, the electric field and the different cell geometry thus allowing to average over all drift cells taking part in a reconstructed trajectory. An energy loss resolution of about 10 % is achieved for minimum ionizing particles and 7−8 % for strong ionizing particles. In combination with the measured momentum it is possible to use the corrected energy loss signal to directly identify protons and pions. Furthermore one can use the method to reduce the background in order to select charged kaons. Mass spectra are presented showing the ability to reconstruct and identify Λ0 and K+-, K-, KS0-, φ- mesons by using a combination of time of flight and energy loss information.
Supported by BMBF

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