Probing a type I 2HDM light Higgs boson in the top-pair-associated diphoton channel

Le résumé fourni par la source

Motivated by the possible 95 GeV diphoton excess, we investigate the capability of the Type-I two-Higgs-doublet model (2HDM-I) to explain this signal under current theoretical and experimental constraints. Using full Monte Carlo simulations for the process of p p → t ( → W + b ) t ¯ ( → W − b ¯ ) h ( → γ γ ) , we evaluate the discovery potential of a 95 GeV Higgs boson at future colliders. Direct Higgs searches strongly constrain the parameter α , excluding the region with α ≲ 0.95 . Monte Carlo results indicate that a minimum cross section of 0.3 fb is required to achieve a 5 σ signal statistical significance at the high-luminosity LHC (HL-LHC) with L = 3 ab − 1 . For the same luminosity, high-energy LHC (HE-LHC) and future circular collider-hadron-hadron (FCC-hh) require 0.67 fb and 2.36 fb, respectively. At the 14 TeV HL-LHC with an integrated luminosity of 3 ab − 1 , parameter regions with sin ( β − α ) ≳ 0.4 and sin ( β − α ) ≳ 0.25 can be probed at the 5 σ and 2 σ significance levels, respectively. At the 27 TeV HE-LHC with L = 10 ab − 1 , the sensitivity improves to sin ( β − α ) ≳ 0.25 ( 5 σ ) and ≳ 0.15 ( 2 σ ). For the 100 TeV FCC-hh with L = 30 ab − 1 , even regions with sin ( β − α ) ≳ 0.1 or sin ( β − α ) ≲ − 0.05 can be covered at the 5 σ level. Parameter regions near sin ( β − α ) ≈ 0 remain challenging to pr

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.