Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Gammaastronomie III

T 74.9: Talk

Wednesday, March 5, 2008, 18:45–19:00, KGII-HS 2006

Gamma-Hadron Separation with TMVA — •Stefan Ohm for the H.E.S.S. collaboration — Max-Planck-Institut für Kernphysik, 69029 Heidelberg

H.E.S.S. is a system of four imaging atmospheric Čerenkov telescopes, operating in the Khomas Highland in Namibia. It explores the origin of Galactic cosmic rays by means of gamma-rays in the energy range from 100 GeV to 100 TeV. One main difficulty in the analysis is the suppression of the vast number of cosmic-ray background events, whilst keeping a large fraction of the gamma-rays.
A new set of parameters designed to increase the separation power between signal and background is combined with variables used in the H.E.S.S. standard analysis in a multidimensional classification algorithm. Tests of this so-called Boosted Decision Tree with Monte Carlo simulations and real data are presented.