Explaining the Higgs Decays at the LHC with an Extended Electroweak Model

TL;DR

This paper proposes an extended electroweak model with an additional charged vector boson doublet to explain the Higgs boson decay anomalies observed at the LHC, aligning theoretical predictions with experimental data.

Contribution

It introduces a novel extended gauge sector model with SU(3)_C x SU(3)_L x U(1)_X symmetry to account for Higgs decay enhancements and deficits at the LHC.

Findings

Good agreement with LHC diphoton decay data

Predicts effects of invisible Higgs decays on branching ratios

Provides a theoretical framework for Higgs decay anomalies

Abstract

We show that the recent discovery of a new boson at the LHC, which we assume to be a Higgs boson, and the observed enhancement in its diphoton decays compared to the SM prediction, can be explained by a new doublet of charged vector bosons from an extended electroweak gauge sector model with SU(3)$_C\otimesSU(3)_L\otimesU(1)_X$ symmetry. Our results show a good agreement between our theoretical expected sensitivity to a 126--125 GeV Higgs boson and the experimental significance observed in the diphoton channel at the 8 TeV LHC. Effects of an invisible decay channel for the Higgs boson are also taken into account, in order to anticipate a possible confirmation of deficits in the branching ratios into $ZZ^*$, $WW^*$, bottom quarks, and tau leptons.