Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 31: Instrumentation and Applications IV

HK 31.2: Talk

Wednesday, March 10, 2004, 14:30–14:45, C

Optimisation of momentum determination in the HADES experiment — •Anar Rustamov¹, Hejdar Agakichiev¹, Vladimir Pechinov¹, Herbert Stroebele², Joachim Stroth^1,2, and Christian Sturm¹ — ¹Gesellschaft fuer Schwerionenforschung, Darmstadt — ²Universitaet Frankfurt

The aim of the HADES experiment is the measurement of e⁺-e⁻ pairs with an invariant mass resolution of 1 per cent. To achieve this goal precise momentum determination is essential. Our method to derive particle momenta from position and direction measurements before and behind a magnetic field is based on an iterative spline fitting procedure. First results from an incomplete analysis of elastic pp interactions yield a resolution in the total detected energy of 4 per cent. The momentum resolution for simulated electrons without multiple scattering ranges from 0.4% to 1% in the momentum region from 100 to 1000 MeV/c, if a position resolution of 100 microns in radial and 200 microns in tangential direction is assumed.