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HK: Physik der Hadronen und Kerne

HK 42: Instrumentation und Anwendungen VII

HK 42.1: Vortrag

Donnerstag, 22. März 2001, 14:30–14:45, A

Tracking for HADES based on a kick-plane algorithm^† — •M. Sánchez³, G. Agakichiev¹, M. Benovic², B. Fuentes³, J.A. Garzón³, R. Holzmann¹, W. Koenig¹, and V. Pechenov⁴ — ¹GSI, Darmstadt, Germany — ²Slovak Academy of Sciences, Bratislava, Slovak Republic — ³U. of Santiago, Santiago de Compostela, Spain — ⁴JINR, Dubna, Russia

Although the HADES spectrometer installed at GSI has been designed primarily to study dilepton production in heavy-ion, as well as proton– and pion-induced reactions, it delivers — next to lepton identification — momentum and velocity of all charged particles, needed for event reconstruction and calibration. The required position information is measured with 2+2 planes of drift chambers (MDC) and the time of flight is obtained from a forward wall of plastic scintillators (TOF) which provide coarse position information as well. A simple tracking algorithm based on the approximation of the magnetic-field deflection by a common kick plane has been developed in the HADES analysis framework HYDRA. In simulations, the momentum resolution obtained with the deflection derived from the TOF position data only is ≤14%. The intrinsic resolution of the approach, however, is estimated to be better than 1%, leaving enough room for the expected improvement with full MDC coverage. The implementation and performance of the algorithm will be discussed, and first results obtained on charged pion and proton momentum spectra from 1.5 AGeV C+C collisions will be presented. ^† supported by GSI, BMBF, INTAS and EU