Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Instrumentation 2

HK 3.3: Vortrag

Montag, 23. März 2015, 15:15–15:30, M/HS2

Backtracking algorithm for dilepton reconstruction with HADES — •Patrick Sellheim for the HADES collaboration — Goethe-Universität Frankfurt

The High Acceptance Di-Electron Spectrometer (HADES) at the GSI Helmholtzzentrum für Schwerionenforschung investigates dilepton and strangeness production in elementary and heavy-ion collisions. Events recorded in Au+Au collisions at a beam energy of 1.23 GeV/u have the highest multiplicities measured with HADES so far. The track reconstruction and particle identification in the high track density environment are hence very challenging.

In case of dileptons a Ring Imaging Cherenkov detector is essential since it is the most important detector component for single lepton identification. Its main purpose is the separation of electrons and positrons from the large background of charged hadrons produced in heavy-ion collisions. In order to further improve the purity and efficiency of the electron sample, a new backtracking algorithm using information provided by the HADES tracking detectors is applied. This new approach offers gains in efficiency for leptons and especially for detection of partially reconstructed pairs with small opening angle. In this contribution the strategy of the backtracking approach and its performance in Au+Au data will be shown.

This work has been supported by BMBF (05P12RFGHJ), GSI, Helmholtz Alliance EMMI, HIC for FAIR, HGS-HIRe.