Measurement of Higgs boson properties using the diphoton decay channel at the Compact Muon Solenoid experiment
File(s)
Author(s)
Bonomally, Shameena
Type
Thesis
Abstract
Measurements of the Higgs boson production cross-sections via the decay of the Higgs
boson to two photons are reported. The measurements are made using data collected in the
period 2016-2018 by the Compact Muon Solenoid detector at the Large Hadron Collider in
proton-proton collisions at a centre-of-mass energy of 13TeV, amounting to an integrated
luminosity of 137 fb−1. The production modes are measured in kinematic regions defined by
the simplified template cross-section framework. Analysis categories targeting Higgs boson
events, produced via vector boson fusion, vector boson associated production (where the
vector boson decays hadronically), and a single top quark associated production (where
the top quark decays hadronically), are specifically discussed. The total Higgs boson signal
strength, relative to the Standard Model prediction, is measured to be 1.14+0.11
−0.10. Other
properties of the Higgs boson are measured, including Standard Model signal strength
modifiers, production cross-sections, and its couplings to other particles. The observed upper
limit on the tH cross-section as a ratio to the Standard Model expectation is 9.47. All results
are found to be in agreement with Standard Model predictions.
boson to two photons are reported. The measurements are made using data collected in the
period 2016-2018 by the Compact Muon Solenoid detector at the Large Hadron Collider in
proton-proton collisions at a centre-of-mass energy of 13TeV, amounting to an integrated
luminosity of 137 fb−1. The production modes are measured in kinematic regions defined by
the simplified template cross-section framework. Analysis categories targeting Higgs boson
events, produced via vector boson fusion, vector boson associated production (where the
vector boson decays hadronically), and a single top quark associated production (where
the top quark decays hadronically), are specifically discussed. The total Higgs boson signal
strength, relative to the Standard Model prediction, is measured to be 1.14+0.11
−0.10. Other
properties of the Higgs boson are measured, including Standard Model signal strength
modifiers, production cross-sections, and its couplings to other particles. The observed upper
limit on the tH cross-section as a ratio to the Standard Model expectation is 9.47. All results
are found to be in agreement with Standard Model predictions.
Version
Open Access
Date Issued
2021-08
Date Awarded
2021-12
Copyright Statement
Creative Commons Attribution NonCommercial NonDerivatives Licence
Advisor
Davies, Gavin
Dauncey, Paul
Publisher Department
Physics
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)