Searching for rare and forbidden exclusive Higgs boson decays with the Atlas detector

Virdee, Govindraj Singh (2022). Searching for rare and forbidden exclusive Higgs boson decays with the Atlas detector. University of Birmingham. Ph.D.

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Searches for Higgs and Z bosons decaying to an ω meson and a photon, and for Higgs bosons decaying to a K\(^∗\) and a photon are discussed using proton collision data recorded by the ATLAS experiment at √s = 13 TeV between 2016 and 2018. The observed events are consistent with the expected background. The obtained 95% confidence level upper limit on the branching ratio for the H → ωγ decay using 89.5 fb\(^{−1}\) of data is 1.0 ×10\(^{−4}\) assuming a Standard Model Higgs Boson production. The analogous limit obtained for the Z → ωγ decay is 3.5 ×10\({−7}\). The obtained upper limit for the H → K\(^∗\)γ decay is 8.9 ×10\(^{−5}\), using 134 fb\(^{−1}\) of data. The search for H → K\(^∗\)γ represents the first search for a flavour-violating exclusive decay of the Higgs boson.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Nikolopoulos, KonstantinosUNSPECIFIEDUNSPECIFIED
Licence: All rights reserved
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Physics and Astronomy
Funders: European Research Council
Subjects: Q Science > QC Physics


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