Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel

Abstract

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

17 pages, 7 figures, 4 tables, Accepted by PRD