h γ Decay: Smoking Gun Signature of Wrong-Sign hbb Coupling
Abstract
We perform a model-independent study of new physics effects in the Higgs decay h γ, focusing on scenarios that spoil the accidental cancellation between the direct and indirect amplitudes. After imposing all existing constraints from Higgs production and decay measurements, we find that a wrong-sign h b b coupling is the only viable scenario capable of enhancing the h γ decay width by nearly two orders of magnitude. Therefore, an observation of a significantly enhanced h γ rate at the LHC or future colliders would provide unambiguous evidence for a wrong-sign h b b coupling, directly pointing to the presence of an extended Higgs sector.
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