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Author ORCID Identifier
https://orcid.org/0000-0001-6169-0517
AccessType
Campus-Only Access for Five (5) Years
Document Type
dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Physics
Year Degree Awarded
2022
Month Degree Awarded
September
First Advisor
Rafael Coelho Lopes de Sa
Subject Categories
Elementary Particles and Fields and String Theory
Abstract
A measurement of off-shell Higgs boson production in the ZZ → 4ℓ decay channel, where ℓ stands for either an electron or a muon, is performed using data from proton-proton collisions at a center-of-mass energy of √s = 13TeV. The data was collected by the ATLAS experiment from 2015 to 2018 at the Large Hadron Collider and corresponds to an integrated luminosity of 139 ifb. An observed (expected) upper limit on the off-shell Higgs signal strength, defined as the event yield normalized to the Standard Model prediction, μoff-shell = 0.99+0.63 −0.57 (μoff-shell = 1.08+0.78 −0.91) is obtained. Assuming the ratio of the Higgs boson couplings to the Standard Model predictions are independent of the momentum transfer of the Higgs boson production mechanism considered in the analysis, a combination with the on-shell signal-strength measurements yields an observed (expected) measurement for the Higgs boson total width is ΓH = 3.02+2.40 −1.70 MeV (ΓH = 4.04+2.28 −2.33 MeV)
DOI
https://doi.org/10.7275/31003970
Recommended Citation
Krishnamurthy, Samyukta, "MEASUREMENT OF THE OFF-SHELL HIGGS BOSON PRODUCTION WITH THE ATLAS DETECTOR" (2022). Doctoral Dissertations. 2631.
https://doi.org/10.7275/31003970
https://scholarworks.umass.edu/dissertations_2/2631
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