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Algorithmen zur Gamma-Hadron-Separation mit den H.E.S.S.-Teleskopen


Ohm,  Stefan
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Ohm, S. (2007). Algorithmen zur Gamma-Hadron-Separation mit den H.E.S.S.-Teleskopen. Diploma Thesis, Ruprecht-Karls Universität, Heidelberg.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7E92-1
H.E.S.S. is a system of four imaging atmospheric Cerenkov 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 gammarays. The first part of this work defines a new set of parameters designed to increase the separation power between signal and background. They show a better gamma-hadron separation compared to the cuts used in the H.E.S.S. standard analysis. Using a classification algorithm, the so-called Random Forest, the combination of these new parameters with variables used in the H.E.S.S. standard analysis is investigated in the second part of this work. Tests with MonteCarlo simulations and real data show good separation power and enhanced background suppression compared to the H.E.S.S. standard analysis.