Discussing 125 GeV and 95 GeV excess in light radion model

Divya Sachdeva,Soumya Sadhukhan

doi:10.1103/physrevd.101.055045

Abstract

Even if the LHC observations are consistent with the Standard model (SM), current LHC results are not precise enough to rule out the presence of new physics. Taking a contrarian view of the SM Higgs fandom, we look out for a more suitable candidate for the 125 GeV boson observed at the LHC. At the same time, a recent result from CMS hints toward an excess near 95 GeV in the diphoton ($\ensuremath{\gamma}\ensuremath{\gamma}$) channel. Given these aspects, we revisit the Higgs-radion mixing model to explore the viability of the radion mixed Higgs to be the 125 GeV boson along with the presence of a light radion (to be precise, Higgs mixed radion) that can show up in future experiments in the $\ensuremath{\gamma}\ensuremath{\gamma}$ channel. We find that the mixed radion-Higgs scenario gives a better fit than the SM, with the radion mixed Higgs as a more suitable 125 GeV scalar candidate. It also gives rise to a diphoton excess from the light radion, consistent with the LHC observations.

Highlights

The discovery of a boson of mass 125 GeV at the LHC validates the Standard Model to be the most predictive model of particle physics
Even if the LHC observations are consistent with the Standard model (SM), current LHC results are not precise enough to rule out the presence of new physics
We find that the mixed radion-Higgs scenario gives a better fit than the SM, with the radion mixed Higgs as a more suitable 125 GeV scalar candidate

Summary

INTRODUCTION

The discovery of a boson of mass 125 GeV at the LHC validates the Standard Model to be the most predictive model of particle physics. It is pertinent to consider innovative model construction aided by enhanced signal strength where BSM physics can be probed at the sub-100-GeV scale Another recent motivation that prods us to probe at lower scales is the variety of mild excesses we have observed over the years [4,5,6]. While some of the observations in this paper have already been noted in the previous works [12,13,14,15] and the diphoton excess due to the light scalar has been discussed in several papers [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31], the data used are current, leading to new bounds, and we show that the extension of SM by such a scalar can give a better fit to the Higgs signal measurement.

MODEL DESCRIPTION

Minimal RS model

Radion-Higgs mixing

THEORETICAL AND EXPERIMENTAL CONSTRAINTS

RESULTS AND DISCUSSION