Analysis of the $ q\bar q\to Z^* \to hA \to4τ$ process within the lepton-specific 2HDM at the LHC
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912841400844288 |
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| author | Ma, Yan Arhrib, A. Moretti, S. Semlali, S. Wang, Y. Yan, Q. S. |
| author_facet | Ma, Yan Arhrib, A. Moretti, S. Semlali, S. Wang, Y. Yan, Q. S. |
| contents | We analyse light Higgs scalar and pseudoscalar associated hadro-production in the 2-Higgs Doublet Model (2HDM) Type-X (or lepton-specific) within the parameter space allowed by theoretical self-consistency requirements as well as the latest experimental constraints from the Large Hadron Collider (LHC), precision data and $B$ physics. Over the viable regions of such a scenario, the Standard Model-like Higgs boson discovered at the LHC in 2012 is the heavier CP-even state $H$. Furthermore, in the Type-X scenario, due to large $\tanβ$, the lighter Higgs scalar $h$ and the pseudoscalar $A$ mainly decay into two $τ$ leptons. Therefore, we concentrate on analysing the signal process $pp\to Z^{*} \to hA\to τ^{+}τ^{-}τ^{+}τ^{-}\to \ell ν_\ell \ell ν_\ell τ_h τ_h$ (where $\ell= e, μ$ whereas $τ_h$ represents the hadronic decay of the $τ$) and explore the feasibility of conducting such a search at the LHC with a centre-of-mass energy of $\sqrt{s}~=$ 14 TeV and a luminosity of $L~=~300~fb^{-1}$. To suppress the huge SM background, we confine ourselves to consider the fraction of signal events with two same-sign $τ$ leptons further decaying into same-sign leptons while the other two $τ$ leptons decay hadronically. We find that a combination of kinematical selection and machine learning (ML) analysis will yields significant sensitivity to this process at the end of the LHC Run 3. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02432 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analysis of the $ q\bar q\to Z^* \to hA \to4τ$ process within the lepton-specific 2HDM at the LHC Ma, Yan Arhrib, A. Moretti, S. Semlali, S. Wang, Y. Yan, Q. S. High Energy Physics - Phenomenology We analyse light Higgs scalar and pseudoscalar associated hadro-production in the 2-Higgs Doublet Model (2HDM) Type-X (or lepton-specific) within the parameter space allowed by theoretical self-consistency requirements as well as the latest experimental constraints from the Large Hadron Collider (LHC), precision data and $B$ physics. Over the viable regions of such a scenario, the Standard Model-like Higgs boson discovered at the LHC in 2012 is the heavier CP-even state $H$. Furthermore, in the Type-X scenario, due to large $\tanβ$, the lighter Higgs scalar $h$ and the pseudoscalar $A$ mainly decay into two $τ$ leptons. Therefore, we concentrate on analysing the signal process $pp\to Z^{*} \to hA\to τ^{+}τ^{-}τ^{+}τ^{-}\to \ell ν_\ell \ell ν_\ell τ_h τ_h$ (where $\ell= e, μ$ whereas $τ_h$ represents the hadronic decay of the $τ$) and explore the feasibility of conducting such a search at the LHC with a centre-of-mass energy of $\sqrt{s}~=$ 14 TeV and a luminosity of $L~=~300~fb^{-1}$. To suppress the huge SM background, we confine ourselves to consider the fraction of signal events with two same-sign $τ$ leptons further decaying into same-sign leptons while the other two $τ$ leptons decay hadronically. We find that a combination of kinematical selection and machine learning (ML) analysis will yields significant sensitivity to this process at the end of the LHC Run 3. |
| title | Analysis of the $ q\bar q\to Z^* \to hA \to4τ$ process within the lepton-specific 2HDM at the LHC |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.02432 |