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Beyond standard model collider phenomenology of Higgs physics and supersymmetry

Beyond standard model collider phenomenology of Higgs physics and supersymmetry
Beyond standard model collider phenomenology of Higgs physics and supersymmetry
In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µV BF / µggF > 1. Finally we extend some ATLAS analyses in the low Δm = m-t − m-01 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.
Thomas, Marc
b001982c-802f-4f5f-b7b5-0585e638183f
Thomas, Marc
b001982c-802f-4f5f-b7b5-0585e638183f
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

(2015) Beyond standard model collider phenomenology of Higgs physics and supersymmetry. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 141pp.

Record type: Thesis (Doctoral)

Abstract

In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µV BF / µggF > 1. Finally we extend some ATLAS analyses in the low Δm = m-t − m-01 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

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Published date: March 2015
Organisations: University of Southampton, Physics & Astronomy

Identifiers

Local EPrints ID: 379264
URI: http://eprints.soton.ac.uk/id/eprint/379264
PURE UUID: 2d338330-5229-447a-b9dd-e6d61f37f006
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 22 Jul 2015 13:37
Last modified: 10 Jul 2018 00:32

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