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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 | Search for a signal of quarks of a fourth generation in same-sign dilepton final states with ATLAS

Dennis Wendland (2010)

Search for a signal of quarks of a fourth generation in same-sign dilepton final states with ATLAS

Master Thesis, Humboldt-Universität zu Berlin.

Currently, a fourth generation of fermions can not be excluded, neither based on
theoretical arguments nor by experimental constraints. In this thesis a method
developed to extract a signal coming from quarks of such a fourth family with the
ATLAS detector at the Large Hadron Collider is presented. The search is performed
with the selection of final states containing two same-sign charged leptons, which
is a rare Standard Model signature. The signal extraction method presented is
a cut-based counting analysis and includes a data-driven background estimation.
The analysis is tested on pseudo data which were created from simulated data sets.
Furthermore, the uncertainties on the obtained results are estimated by a so-called
"Toy Monte Carlo Study". An optimisation of the cuts is finally performed using a
multivariate analysis in order to maximise the significance.