Measurement of Higgs effective coupling parameters in the ggF production and WW -> lvlv decay mode at sqrt(s)=13TeV with the ATLAS experiment

Abstract

This thesis presents and discusses measurement of effective field theory couplings of the Higgs boson to weak vector bosons. The analysis uses data collected during the LHC Run 2 data taken at sqrt(s) = 13 TeV by the ATLAS detector corresponding to a total integrated luminosity of 36.07 fb−1. The measurement focuses on the gluon fusion production mode, targeting H → W±W∓∗ → l−ν ̄ll′+νl′ decays. The SM Higgs boson observed signal strength was measured as μ = 1.258+0.208−0.200 with an observed and expected significance of Zobs. = 6.6σ and Zexp. = 5.3σ. With the use of an Effective Lagrangian Morphing interpolation technique a CP-even and a CP-odd Higgs to W boson effective coupling parameter was measured. Both the signal strength and effective coupling parameter measurement show no significant deviation from the Standard Model.