CERN Accelerating science

Thesis
Report number	CERN-THESIS-2012-483
Title	Multijet Background Estimation for Supersymmetry Searches Using the ATLAS Detector at the Large Hadron Collider
Author(s)	Owen, Simon (Sheffield U.)
Publication	134.
Thesis note	PhD : Sheffield U. : 2012
Thesis supervisor(s)	Costanzo, Davide
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	This thesis describes a data-driven technique for estimating the multijet background to Supersymmetry (SUSY) searches with no leptons using the ATLAS detector at the Large Hadron Collider. The technique is used to estimate multijet distributions in SUSY signal and control regions with 1 fb−1of √s = 7 TeV data collected by ATLAS in 2011. The systematic uncertainty on the estimates is reduced with the development and use of novel event shape triggers. Multijet estimates provided from the technique developed in this thesis are used by the ATLAS collaboration in several different SUSY searches.

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