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

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)${}_C\text{otimesSU}(3{)}_L\text{otimesU}(1{)}_X$ 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 $Z{Z}^{\ast }$, $W{W}^{\ast }$, bottom quarks, and tau leptons.

Comments: 16 pages, 5 figures