Backtracking algorithm for lepton reconstruction with HADES

FAIR Next Generation ScientistS 2014

Sellheim, P.^1

Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, Frankfurt am Main

60438, Germany^1

关键词: Backtracking algorithm;    Detector components;    Heavy ion collision;    High acceptance di-electron spectrometers;    Particle identifications;    Ring Imaging Cherenkov detector;    Strangeness production;    Track reconstruction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/599/1/012027/pdf
DOI  :  10.1088/1742-6596/599/1/012027

来源: IOP

【 摘 要 】

The High Acceptance Di-Electron Spectrometer (HADES) 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. The most important detector component for lepton identification is the Ring Imaging Cherenkov detector. Its main purpose is the separation of electrons and positrons from large background of charged hadrons produced in heavy-ion collisions. In order to improve lepton identification this backtracking algorithm was developed. In this contribution we will show the results of the algorithm compared to the currently applied method for e+/-identification. Efficiency and purity of a reconstructed e+/-sample will be discussed as well.