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General one-loop contributions to the decay amplitudes $H\rightarrow\nu_l\bar{\nu}_l\gamma$ are presented, considering all possible contributionsof additional heavy vector gauge bosons, fermions, and charged (and alsoneutral) scalar particles appearing in the loop diagrams. Moreover, the resultscan be applied directly when extra neutrinos (apart from three ones in standardmodel) are taken into account in final states. Analytic results are presentedin terms of Passarino-Veltman scalar functions which can be evaluatednumerically using {\tt LoopTools}. In the standard model framework, theseanalytical results are generated and cross-checked with previous computations.We find that our results are well consistent with these computations. Withinstandard model limit, phenomenological results for the decay channels are alsostudied using the updated input parameters at the Large Hadron Collider.

General one-loop contributions to the decay $H\rightarrow \nu_l\bar{\nu}_l\gamma$