A Search for tt ̄ Resonances in the Lepton Plus Jets Channel from Proton-Proton Collisions at √s = 8 TeV with the ATLAS Detector

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2014

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Abstract

A search for the resonant production of top quark pairs in

proton-proton collisions at a center-of-mass energy of 8~TeV is

presented.

The Large Hadron Collider delivered 14 inverse femtobarns of collision

data which were collected by the ATLAS detector.

The lepton plus jets final state is used, and the top pair invariant

mass spectrum is probed for local excesses above the Standard Model

background prediction.

No evidence for resonant top pair production is found.

95\% credibility limits are set on the cross section times branching

ratio of two signal benchmarks.

A narrow leptophobic topcolor $Z^\prime$ boson decaying to top quark

pairs and the Kaluza-Klein excitation of the gluon in a

Randall-Sundrum model are excluded for masses below 1.8 and 2.0~TeV,

respectively.

The expected sensitivity to new physics at ATLAS with proton-proton

collisions delivered by a High Luminosity Large Hadron Collider is

also presented.

The feasibility of analyses studying vector boson scattering, exotic

resonances, and an extended Higgs sector with up to 3000 inverse

femtobarns of integrated luminosity is investigated based on the fast

simulation of proton-proton collisions at a center-of-mass energy of

14~TeV.

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Pollard, Chris (2014). A Search for tt ̄ Resonances in the Lepton Plus Jets Channel from Proton-Proton Collisions at √s = 8 TeV with the ATLAS Detector. Dissertation, Duke University. Retrieved from https://hdl.handle.net/10161/9114.

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