Search for a high mass Higgs boson decaying into two W bosons in the dileptonic final state with CMS

Roy, Dennis Mario; Stahl, Achim (Thesis advisor); Lohmann, Wolfgang (Thesis advisor)

Aachen : RWTH Aachen University (2022, 2023)
Dissertation / PhD Thesis

Dissertation, RWTH Aachen University, 2022

Abstract

A search is performed for an additional Higgs boson decaying into a pair of W bosons in the fully leptonic final state. The analysis uses data from proton-proton collisions recorded by the Compact Muon Solenoid experiment at the Large Hadron Collider. Data were recorded in 2016, 2017 and 2018 and correspond to an integrated luminosity of 138 fb^-1. New techniques are implemented in the analysis to improve the sensitivity of the search, especially in the mass range above 1 TeV. In one of the considered scenarios, a local excess in data is observed at a mass of 650 GeV with a global significance of 2.6 σ. The results of the analysis include 95% CL upper limits on the product of the cross section and branching fraction of a high mass signal, as well as exclusion limits on various Two Higgs-Doublet Models and Minimal Supersymmetric Standard Model benchmark scenarios.

Institutions

• Department of Physics [130000]
• Chair of Experimental Physics III B [133510]