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arXiv · 2209.01200

$h \to \Upsilon \gamma$ Decay: Smoking Gun Signature of Wrong-Sign $hb\bar{b}$ Coupling

Aditya Batra·Sanjoy Mandal·Rahul Srivastava
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Abstract

We perform a model-independent study of new physics effects in the Higgs decay $h \to \Upsilon \gamma$, 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 $h b\bar b$ coupling is the only viable scenario capable of enhancing the $h \to \Upsilon \gamma$ decay width by nearly two orders of magnitude. Therefore, an observation of a significantly enhanced $h \to \Upsilon \gamma$ rate at the LHC or future colliders would provide unambiguous evidence for a wrong-sign $h b\bar b$ coupling, directly pointing to the presence of an extended Higgs sector.

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Aditya Batra, Sanjoy Mandal, Rahul Srivastava. 2022-09-02. $h \to \Upsilon \gamma$ Decay: Smoking Gun Signature of Wrong-Sign $hb\bar{b}$ Coupling. https://arxiv.org/abs/2209.01200

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