Multi high charged scalars in the LHC searches and Majorana neutrino mass generations

TL;DR

This paper investigates models with high-charged scalars that can explain the LHC's Higgs decay excesses and generate Majorana neutrino masses at two-loop level without new symmetries, predicting observable multi-charged scalars.

Contribution

It introduces a class of models with high-dimensional scalar representations that link Higgs decay anomalies to neutrino mass generation without additional symmetries.

Findings

Enhanced $H\to\gamma\gamma$ rate due to multi-charged scalars

Altered $H\to Z\gamma$ decay rate consistent with diphoton changes

Prediction of multi-charged scalars accessible at the LHC

Abstract

One natural way to understand the excess of the measured $H\to\gamma\gamma$ rate over the standard model (SM) expectation at the Large Hadron Collider (LHC) is to have charged scalar bosons, existing in most of the SM extensions. Motivated by this LHC result, we explore if it also sheds light on solving the small neutrino mass generation problem. We concentrate on a class of models with high dimensional representations of scalars to realize Majorana neutrino masses at two-loop level without imposing any new symmetry. In these models, multi scalars with the electric charges higher than two are naturally expected, which not only enhance the $H\to\gamma\gamma$ rate, but provide more searching grounds at the LHC. In particular, the rate of $H\to Z\gamma$ also changes similar to that of the diphoton channel.