Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel
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2024
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| _version_ | 1866908859352743936 |
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| author | Dong, Yabo Wang, Kun Zhu, Jingya |
| author_facet | Dong, Yabo Wang, Kun Zhu, Jingya |
| contents | 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 $pp \to t(\to W^+ b)\bar{t}(\to W^- \bar{b})h(\to γγ)$, 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 $α\lesssim 0.95$. Monte Carlo results indicate that a minimum cross section of 0.3 fb is required to achieve a $5σ$ 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 $\sin(β-α) \gtrsim 0.4$ and $\sin(β-α) \gtrsim 0.25$ can be probed at the $5σ$ and $2σ$ significance levels, respectively. At the 27 TeV HE-LHC with $L = 10~\mathrm{ab}^{-1}$, the sensitivity improves to $\sin(β-α) \gtrsim 0.25$ ($5σ$) and $\gtrsim 0.15$ ($2σ$). For the 100 TeV FCC-hh with $L = 30~\mathrm{ab}^{-1}$, even regions with $\sin(β-α) \gtrsim 0.1$ or $\sin(β-α) \lesssim -0.05$ can be covered at the $5σ$ level. Parameter regions near $\sin(β-α) \approx 0$ remain challenging to probe in the diphoton channel, even with increased energy or luminosity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_13636 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel Dong, Yabo Wang, Kun Zhu, Jingya High Energy Physics - Phenomenology High Energy Physics - Experiment 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 $pp \to t(\to W^+ b)\bar{t}(\to W^- \bar{b})h(\to γγ)$, 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 $α\lesssim 0.95$. Monte Carlo results indicate that a minimum cross section of 0.3 fb is required to achieve a $5σ$ 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 $\sin(β-α) \gtrsim 0.4$ and $\sin(β-α) \gtrsim 0.25$ can be probed at the $5σ$ and $2σ$ significance levels, respectively. At the 27 TeV HE-LHC with $L = 10~\mathrm{ab}^{-1}$, the sensitivity improves to $\sin(β-α) \gtrsim 0.25$ ($5σ$) and $\gtrsim 0.15$ ($2σ$). For the 100 TeV FCC-hh with $L = 30~\mathrm{ab}^{-1}$, even regions with $\sin(β-α) \gtrsim 0.1$ or $\sin(β-α) \lesssim -0.05$ can be covered at the $5σ$ level. Parameter regions near $\sin(β-α) \approx 0$ remain challenging to probe in the diphoton channel, even with increased energy or luminosity. |
| title | Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2410.13636 |