Search for dark Higgs boson production in pp events at √s = 13 TeV with the ATLAS detector at the LHC

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dc.contributor.author Wright, Benjamin
dc.date.accessioned 2021-11-18T20:18:28Z
dc.date.available 2021-11-18T20:18:28Z
dc.date.copyright 2021 en_US
dc.date.issued 2021-11-18
dc.identifier.uri http://hdl.handle.net/1828/13521
dc.description.abstract This thesis presents the design of a signal region, as well as two control regions to constrain the tt ̄ background, in the search for the theorized dark sector process qq ̄ → Z′∗ → Z′s with s → W W → qq ̄lν and Z′ → χχ(invisible). In this process, dark matter is produced as a new heavy vector boson, Z′, together with a scalar “dark Higgs” boson, s, that decays to a pair of W bosons with a semileptonic final state. In this model, a new Higgs mechanism associated with s generates the masses of the dark sector particles, and the mixing of s with the Standard Model Higgs boson allows it to decay to Standard Model particles and be observable over a large range of model parameter space at the Large Hadron Collider. This search uses 139 fb−1 of proton-proton collision data collected by the ATLAS experiment at a center-of-mass energy of 13 TeV. Using the designed signal and control regions, in this search we will be able to exclude Z′ masses up to a range between approximately 1200 to 2200 GeV, and s masses from approximately 150 GeV up to a range between approximately 290 to 360 GeV. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.title Search for dark Higgs boson production in pp events at √s = 13 TeV with the ATLAS detector at the LHC en_US
dc.type Thesis en_US
dc.contributor.supervisor Albert, Justin E.
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

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