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 $pp\to t(\to W^{+}b)\overline{t}(\to W^{-}\overline{b})h(\to \gamma \gamma )$, we evaluate the discovery potential of a 95 GeV Higgs boson at future colliders. Direct Higgs searches strongly constrain the parameter $\alpha$, excluding the region with $\alpha \lesssim 0.95$. Monte Carlo results indicate that a minimum cross section of 0.3 fb is required to achieve a $5\sigma$ signal statistical significance at the high-luminosity LHC (HL-LHC) with $L=3{\mathrm{ab}}^{-1}$. 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 $3{\mathrm{ab}}^{-1}$, parameter regions with $\sin (\beta -\alpha )\gtrsim 0.4$ and $\sin (\beta -\alpha )\gtrsim 0.25$ can be probed at the $5\sigma$ and $2\sigma$ significance levels, respectively. At the 27 TeV HE-LHC with $L=10{\mathrm{ab}}^{-1}$, the sensitivity improves to $\sin (\beta -\alpha )\gtrsim 0.25$ ($5\sigma$) and $\gtrsim 0.15$ ($2\sigma$). For the 100 TeV FCC-hh with $L=30{\mathrm{ab}}^{-1}$, even regions with $\sin (\beta -\alpha )\gtrsim 0.1$ or $\sin (\beta -\alpha )\lesssim -0.05$ can be covered at the $5\sigma$ level. Parameter regions near $\sin (\beta -\alpha )\approx 0$ remain challenging to probe in the diphoton channel, even with increased energy or luminosity.

Close

PrevNext

Reuse & PermissionsView figure in article

• 
• 
• 
• 
• 
• 
• 

• Extensions of Higgs sector
• Extensions of scalar sector
• Hypothetical particle physics models
• Hypothetical scalars