Licentate Thesis: Data Driven Estimates of Dilepton Final State Backgrounds in ATLAS
by
Karl Gellerstedt(SU Fysikum)
→
Europe/Stockholm
A4:1003
A4:1003
Description
The Large Hadron Collider at the international particle physics laboratory CERN in
Switzerland is currently the most powerful particle accelerator on earth. Protons are collided
at an energy of √s=7. The goal is to find new phenomena not described by the Standard Model
of particle physics. ATLAS is one of the detectors that record the collision processes.
Many processes will result in high energy leptons (electrons and muons), measured by
ATLAS. A significant fraction of the recorded lepton are however produced in background
processes that are difficult to model in simulations. A general method using data will be
described that estimates the background due to mis-identified leptons.
An estimate of the mis-identified lepton background will be used in an analysis that
simultaneously measures the cross-sections of three important Standard Model processes.
