Effect of Charged Scalar Loops on Photonic Decays of a Fermiophobic Higgs

TL;DR

This paper investigates how charged Higgs boson loops influence the decay of a fermiophobic Higgs into two photons, revealing potential significant constructive or destructive effects that impact collider detection.

Contribution

It demonstrates the substantial impact of charged Higgs loops on the photonic decay rate of fermiophobic Higgs bosons within the Two Higgs Doublet Model (Type I).

Findings

Charged Higgs loops can significantly alter the b2( ext{h}_f o \u03b3\u03b3) decay rate.

Loop effects can be both constructive and destructive, exceeding experimental measurement precision.

Implications for Higgs detection strategies at future colliders.

Abstract

Higgs bosons with very suppressed couplings to fermions ("Fermiophobic Higgs bosons", h_f) can decay to two photons (\gamma\gamma) with a branching ratio significantly larger than that expected for the Standard Model Higgs boson for m_{h_f}<150 GeV. Such a particle would give a clear signal at the LHC and can arise in the Two Higgs Doublet Model (type I) in which h_f -> \gamma\gamma is mediated by W^+ and charged Higgs boson (H^+) loops. We show that the H^+ loops can cause both constructive and destructive contributions with a magnitude considerably larger than the anticipated precision in the measurement of the photonic decay channel at future hadron and lepton colliders.