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

Akeroyd, A. G.; Diaz, Marco A.; Rivera, Maximiliano A.

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

Authors

Akeroyd, A. G.

Diaz, Marco A.

Rivera, Maximiliano A.

Description

Higgs bosons with very suppressed couplings to fermions ("Fermiophobic Higgs bosons", h_f) can decay to two photons (γγ) 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 -> γγis 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.
18 pages, 5 figures, clarifications added, one reference added, accepted by Physical Review D