95 GeV light Higgs in the top-pair-associated diphoton channel at the LHC in the minimal dilaton model*

Abstract

Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector, we undertake a study to explore the feasibility of detecting a 95 GeV light Higgs boson decaying into diphoton within the Minimal Dilaton Model (MDM) at the 14 TeV LHC. Initially, we identify the correlations between the production cross section, decay branching ratios, and model parameters, e.g., the scalar mixing angle $\sin\theta_S$. Subsequently, we utilize Monte Carlo simulations to generate the signal of the light Higgs boson via the process $pp \to t\bar{t}(s\to \gamma\gamma)$, along with the corresponding backgrounds. To effectively separate the signal from the dominant backgrounds $tt\gamma\gamma$, we employ a meticulous cut-based selection process. Ultimately, we find that with an integrated luminosity of $L = 3000 \fbm$, the regions of $|\sin\theta_S|>0.2$ can be covered at over a $3\sigma$ level. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.