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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Experimentelle Elementarteilchenphysik | ATLAS | Theses | Rekonstruktion von Kaonspuren bei ATLAS für Analysen zur Elektronfehlidentifikation

Anna-Sophia Schade (2010)

Rekonstruktion von Kaonspuren bei ATLAS für Analysen zur Elektronfehlidentifikation

Bachelor Thesis, Humboldt Universität zu Berlin.

The following analysis deals with the reconstruction of kaon tracks in the ATLAS detector at the particle accelerator LHC at CERN in Geneva. These kaon tracks potentially imitate properties of electrons as they are measured in the ATLAS detector. For exploring these electron fakes, it is important to reconstruct the kaons as precise as possible. In this paper different possibilities for kaon reconstruction are investigated. One possibility is the reconstruction of the  meson. Since this meson decays into two oppositely charged kaons, measured tracks can be combined and checked whether they produce the wanted  meson. Despite the huge combinatorial back- ground it was possible to reconstruct the  meson with a purity of 60 %. Still most reconstructed tracks are kaons, which can be used for fake studies. A fake study under these conditions is limited to a small range of momentum (0,2 to 0,5 GeV). It is also possible for kaon reconstruction to search for other particles decaying in kaons. Candidates are the D and K (892) mesons. The reconstruction of these mesons with regards to the reduction of combinatorial background seems equally difficult. It is too imprecise, consequently the kaon tracks can not be used for fake studies. The achieved purities are 77 % for the D meson and 0,5 % for K (892) mesons. This analysis demonstrates a preliminary study for kaon track reconstruction at ATLAS. Possible ways to improve the results are discussed and motivated.