Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.13: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

Backtracking algorithm for lepton recontruction with HADES — •Patrick Sellheim for the HADES collaboration — Goethe-Universität Frankfurt

The HADES (High Acceptance Di-Electron Spectrometer) at the GSI Helmholtzzentrum für Schwerionenforschung investigates dilepton and strangeness production in elementary and heavy-ion collisions. In April - May 2012 HADES recorded 7 billion Au+Au events at a beam energy of 1.23 GeV/u with the highest multiplicities measured so far. The track reconstruction and particle identification in the high track density environment are challenging.
Most important detector component for lepton identification is a Ring Imaging Cherenkov detector. Its main purpose is the separation of electrons and positrons from large background of charged pions produced in heavy-ion collisions. In order to improve lepton identification a new backtracking algorithm was developed.
In this contribution we will show the results of a new backtracking algorithm compared to the currently applied method for e^−/+ identification. Efficiency and purity of a reconstructed e^−/+ sample will be discussed as well.
Supported by BMBF (05P12RFGHJ), Helmholtz Alliance EMMI, HIC for FAIR, HGS-HIRe and H-QM.