Correlation of $h\rightarrow\gamma\gamma$ and $Z\gamma$ in Type-II seesaw neutrino model

TL;DR

This paper investigates how charged scalars in the Type-II seesaw neutrino model affect Higgs decay channels to gamma gamma and Z gamma, revealing a positive correlation in most parameter space and potential experimental signatures.

Contribution

It provides a detailed analysis of charged scalar effects on Higgs decay channels within the Type-II seesaw model, highlighting the correlation patterns and experimental implications.

Findings

Positive correlation between $h\rightarrow \gamma\gamma$ and $h\rightarrow Z\gamma$ in most parameter space.

If $h\rightarrow \gamma\gamma$ excess persists, $h\rightarrow Z\gamma$ should also be enhanced.

Anti-correlation occurs only in specific regions of parameter space.

Abstract

We study the charged scalar contributions to the Higgs decay channels of $h\rightarrow \gamma\gamma$ and $h\rightarrow Z\gamma$ in the Type-II seesaw neutrino model. In most of the allowed parameter space in the model, the new contribution to $h\rightarrow Z\gamma$ is positively correlated with that to $h\rightarrow\gamma\gamma$. If the current excess of the $h\rightarrow \gamma\gamma$ rate measured by the ATLAS Collaboration persists, the $h\rightarrow Z\gamma$ rate should be also larger than the corresponding standard model prediction. We demonstrate that the anti-correlation between $h\rightarrow\gamma\gamma$ and $h\rightarrow Z\gamma$ only exists in some special region.