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Z' phenomenology in tt¯ and its asymmetries at the LHC

Z' phenomenology in tt¯ and its asymmetries at the LHC
Z' phenomenology in tt¯ and its asymmetries at the LHC
This thesis presents a collection of studies considering Z' physics in the tt¯ final state at the Large Hadron Collider (LHC), focusing largely on its charge and spin asymmetry observables. The analyses employ parton level simulations in the presence of the tree-level backgrounds and realistic reconstruction efficiency estimates. A number of extra U (1) models are studied, including various common benchmark models currently considered at the LHC as well as models more suited to tt¯ searches from composite Higgs scenarios and extra dimensions. The studies address the ability of tt¯, with its asymmetries, to distinguish models from the Standard Model background and one another, both on its own and as a complementary channel to other, more traditional final states with the view to a complete characterisation of the Z' couplings. Scenarios with two quasi-degenerate resonances are also considered where tt¯ asymmetries can identify their presence when cross section observables cannot resolve the two peaks.
Mimasu, Ken
4df8b481-263e-4185-89b8-32cbd43b7c26
Mimasu, Ken
4df8b481-263e-4185-89b8-32cbd43b7c26
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614

Mimasu, Ken (2014) Z' phenomenology in tt¯ and its asymmetries at the LHC. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 172pp.

Record type: Thesis (Doctoral)

Abstract

This thesis presents a collection of studies considering Z' physics in the tt¯ final state at the Large Hadron Collider (LHC), focusing largely on its charge and spin asymmetry observables. The analyses employ parton level simulations in the presence of the tree-level backgrounds and realistic reconstruction efficiency estimates. A number of extra U (1) models are studied, including various common benchmark models currently considered at the LHC as well as models more suited to tt¯ searches from composite Higgs scenarios and extra dimensions. The studies address the ability of tt¯, with its asymmetries, to distinguish models from the Standard Model background and one another, both on its own and as a complementary channel to other, more traditional final states with the view to a complete characterisation of the Z' couplings. Scenarios with two quasi-degenerate resonances are also considered where tt¯ asymmetries can identify their presence when cross section observables cannot resolve the two peaks.

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Published date: January 2014
Organisations: University of Southampton, Physics & Astronomy

Identifiers

Local EPrints ID: 363266
URI: http://eprints.soton.ac.uk/id/eprint/363266
PURE UUID: f0e23e4b-cebf-4045-9382-ed208350e4eb

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Date deposited: 31 Mar 2014 10:15
Last modified: 18 Jul 2017 02:41

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Contributors

Author: Ken Mimasu
Thesis advisor: Stefano Moretti

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