Effect of Charged Scalar Loops on Photonic Decays of a Fermiophobic Higgs
Abstract
Higgs bosons with very suppressed couplings to fermions ("Fermiophobic Higgs bosons", hf) can decay to two photons (γγ) with a branching ratio significantly larger than that expected for the Standard Model Higgs boson for mhf<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 hf -> γγ 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.
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