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 $\gamma \gamma$, $W^{\ast }{W}^{\ast }$, $Z^{\ast }{Z}^{\ast }$, $Zb\bar{b}$, $Z\gamma$, $\gamma b\bar{b}$, and final states involving vector mesons like ${\rm Y}$, $J/\Psi$ and $\rho$. In order to calculate these branching ratios we perform a complete one-loop renormalization of the vertices $HZ\gamma$ and $H\gamma \gamma$. The decay mode $H\to \gamma \gamma$ 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 $Z$, $\gamma$, $\rho$, $J/\Psi$, and ${\rm Y}$ are carefully analyzed.

Comments: 7 pages (plain tex), figures not included, VAND-TH-94-1