Decays of a fermiophobic Higgs

Abstract

We explore the phenomenology of a fermiophobic Higgs: a Higgs whose couplings to fermions are suppressed. We calculate the branching ratios of a Higgs decaying to $γγ$, $W^*W^*$, $Z^*Z^*$, $Zb\bar b$, $Zγ$, $γb\bar b$, and final states involving vector mesons like $Υ$, $J/Ψ$ and $ρ$. In order to calculate these branching ratios we perform a complete one-loop renormalization of the vertices $HZγ$ and $Hγγ$. The decay mode $H\rightarrow γγ$ is near unity for a Higgs below the $W$ mass, which provides a clean way of discovering a light fermiophobic Higgs. Interesting modes involving the vector mesons $Z$, $γ$, $ρ$, $J/Ψ$, and $Υ$ are carefully analyzed.