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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 | Untersuchungen zur Bestimmung der Fehlidentifikationsraten von Leptonen im ATLAS-Experiment

Sebastian Beumler (2010)

Untersuchungen zur Bestimmung der Fehlidentifikationsraten von Leptonen im ATLAS-Experiment

Master Thesis, Humboldt Universität zu Berlin.

Electrons and muons play a very important role in many ongoing physics analyses at the ATLAS experiment. Therefore, a deep understanding of leptonic fake rates is a crucial aspect in estimating systematic uncertainties. This thesis deals with the determination of the fake rates. Studies of simulated pp-collisions indicate that pions, protons and kaons most probably provide the particles that could be misidentified as charged leptons. A data-driven method is presented on how to select falsely reconstructed leptons. The reconstruction of decays of K0s as well as to provide very pure samples of pions and protons that can be used to measure the misidentification probability dependent on transverse momentum, pseudorapidity and an isolation criterion. The determination of the leptonic fake rate requires the use of Monte Carlo simulations to optain the relative abundances of the particles in question. Fake rates for electrons and muons are measured for an integrated luminosity of 2 pb-1 at a centre-of-mass energy of 7 GeV to an upper limit for the transverse momentum of 10 GeV. Due to the increase in data being collected, determining fake rates for transverse momenta up to 100 GeV seems realistic.