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arXiv · 2405.16239

Revisiting the Higgs Boson Decay into a Photon and a Neutrino Pair

Aliaksei Kachanovich·Ivan Nišandžić
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Abstract

We present new calculations of the leading-order one-loop amplitude and the decay rate for $H\to \nu \bar{\nu} \gamma$ within the standard model, employing reduction to a set of basic Passarino-Veltman functions resulting in more concise expressions compared to prior works. Our result for the total decay rate is $\Gamma(H\to \nu\bar{\nu} \gamma)=1.33\,\text{keV}$, in close agreement with the narrow width approximation (NWA) for the intermediate Z boson. A comparison with previous results available in the literature is also provided. We evaluate the differential decay rate with respect to the energy of the photon and find that the non-resonant contributions from box diagrams beyond the NWA notably affect the kinematic region associated with high-energy photons, where the intermediate Z boson is offshell. This suggests potential implications for searches of dark sector mediators, particularly in future lepton collider experiments.

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Aliaksei Kachanovich, Ivan Nišandžić. 2024-05-25. Revisiting the Higgs Boson Decay into a Photon and a Neutrino Pair. https://arxiv.org/abs/2405.16239

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