DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

T: Fachverband Teilchenphysik

T 36: Top-Quarks 4

T 36.9: Talk

Tuesday, March 5, 2013, 18:45–19:00, HSZ-02

New Method to Estimate W+jets Background in tt Events at the ATLAS Experiment — •Arwa Bannoura — Bergische Universität Wuppertal

W +4 jets is the major background process for the tt semi-leptonic channel and other processes. In this analysis a new data driven method to estimate the W+jets background process is introduced. The idea of the method is to use Z+jets events to model W+jets events. The production of W and Z bosons is similar and the mechanism of associated jet production. An algorithm was used to convert Z+jets to be similar to W+jets by scaling the momentum of the two leptons and using one lepton to model ETmiss. Observables are compared and chosen based on their separation power between W+jets and tt events and their similarity between W+jets and converted Z+jets events. A binned maximum-likelihood fit is done in a neural network output distribution to measure the rate of W+jets events.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2013 > Dresden