Search for Associated Production of Higgs and V Bosons with Boosted Jet Tagging in Semileptonic Events

This thesis presents the first search for associated production of a boosted Higgs boson decaying to WW along with a V boson, i.e., a W or Z boson decaying hadronically. The search is performed using data collected with the CMS detector corresponding to 139 fb^-1 of LHC proton-proton collision data at sqrt(s) = 13 TeV. We target semileptonic decays of the Higgs boson, where the hadronic and leptonic W decays are merged inside a wide-radius AK8 jet. Events are selected using machine-learning taggers to identify the Higgs boson jet and the V boson jet.