Degree Type

Dissertation

Date of Award

2014

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

First Advisor

James Cochran

Abstract

A search is presented for the pair production of a new heavy quark, T, assuming that it has a significant branching ratio to decay into a W boson and a light-flavor quark, q. The search is based on the 20 fb-1 of proton-proton collision data at sqrt{s}= 8 TeV recorded in 2012-2013 with the ATLAS detector at the Large Hadron Collider. Data are analyzed in the lepton+jets channel, which is characterized by a high transverse momentum electron or muon, large missing transverse momentum, and at least four jets. The analysis strategy relies on the substantial momentum transferred to all of the decay products of the heavy quark. No significant excess above the Standard Model expectation is observed and 95% confidence level upper limits are derived on the cross section times the branching ratio of T quark in the lepton+jets channel.

DOI

https://doi.org/10.31274/etd-180810-3601

Copyright Owner

Suyog Shrestha

Language

en

File Format

application/pdf

File Size

166 pages

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