arXiv subjects

Es-said Ghourmin

Publications and source records attributed to Es-said Ghourmin.

4 recordsLinked to original sources

arXiv2026

Probing the Inert Scalar Sector of the Inert Doublet Model via Vector-Boson Fusion at a Muon Collider

We investigate the sensitivity of a future high-energy muon collider (MuCs) to the inert scalar sector of the Inert Doublet Model (IDM) through a comprehensive set of $2\to4$ electroweak gauge-boson fusion processes. The scalar spectrum consists of two CP-even neutral scalars: $h$ and $H$, one CP-odd neutral scalar $A$, and a pair of charged scalars $H^\pm$. We assume the neutral scalar $H$ to be the lightest inert state and the dark matter (DM) candidate, while the observed $125$~GeV Higgs boson is identified with the scalar of the Standard Model-like doublet. We consider charged Higgs pair production: $μ^+μ^-\to H^+H^-ν\barν$ induced by WW fusion, as well as the associated channels: $μ^+μ^-\to HH^\pmμ^\mpν$ and $μ^+μ^-\to AH^\pmμ^\mpν$, induced by $WZ$ and $Wγ$ fusion. Owing to their Vector Boson Fusion (VBF) origin, the corresponding cross sections increase significantly with collider energy, making them particularly well suited for exploration at a high-energy MuCs. We first study the $2\to 2$ subprocesses $WW\to H^+ H^-$ and $WV\to H^+ S_i$, $V=Z, γ$ and $S_i=H$ or $A$ and establish the destructive interference among the contributing diagrams. After imposing theoretical consistency requirements and current experimental constraints, including those from DM and collider searches, we evaluate the corresponding signal rates at $\sqrt{s}=3$, $10$, and $20$~TeV. We further perform a detector-level Monte Carlo analysis combined with a cut-based signal-background selection. Our results demonstrate that the sensitivity to inert scalar production increases significantly with collision energy, establishing the 10 and 20~TeV MuCs stages as powerful probes of the IDM inert scalar sector.

hep-ph↗

arXiv2025

Searching for charged Higgs bosons via $e^+ e^- \to H^\pm W^\mp S$ at the ILC

We investigate the phenomenology of the charged Higgs boson at the International Linear Collider (ILC) within the framework of the type-X Two-Higgs Doublet Model (2HDM), where a light charged Higgs boson, with a mass around 200 GeV or even smaller than top quark mass, is still being consistent with flavor physics data as well as with the colliders experimental data. In the theoretically and experimentally allowed parameter space, the $e^+ e^- \to H^\pm W^\mp S$ (with $S = H, A$) production processes can yield signatures with event rates larger than those from $e^+ e^- \to H^+ H^-$ and offer sensitivity to the Higgs mixing parameter $\sin(β-α)$. We consider the bosonic $H^\pm \to W^\pm S$ decays, where the neutral scalar $S$ further decays into a pair of tau leptons. We show, through a detector-level Monte Carlo analysis, that the resulting $[ττ][ττ] WW$ final state could be seen at the ILC with at least 500 GeV center-of-mass energy and 500 fb$^{-1}$ of luminosity.

hep-ph↗

arXiv2024

Associated charged Higgs production within the 2HDM: $e^-e^+$ versus $μ^-μ^+$ colliders

Our goal is to investigate the charged Higgs phenomenology in the framework of 2HDM at the upcoming $e^+e^-$ and muon colliders. We are primarily concerned with the associated production processes with a fermion pair: $\ell^+ \ell^- \to τ^+ ν_{τ}H^-$ and $\ell^+ \ell^- \to t \bar{b} H^-$, as well as with the W boson and a neutral Higgs boson: $\ell^+ \ell^- \to W^\pm H^\mp S$ ($S=h,\,H,\, A$) and $\ell^+ \ell^- \to W^\pm H^\mp Z$. We first update the results for $e^+e^- \to \{ τ^+ ν_{τ}H^-\ , \ t \bar{b} H^-\}$ and then discuss our findings for $e^+e^- \to \{ W^\pm H^\mp S\}$ for various center of mass energies 500 GeV, 1 TeV, 1.5 TeV and 3 TeV. In the case of muon collider, we show that the new s-channel and t-channel diagrams can increase the cross sections by virtue of their Yukawa couplings. We systematically compare our results for the muon collider with those obtained at the International Linear (ILC) and Compact Linear (CLIC) colliders. We select benchmark points and conduct signal-background analyses, incorporating detector simulations. For a 3 TeV muon collider, our results show an exclusion region at the 2$σ$ level and a discovery region at the 5$σ$ level.

hep-ph↗

arXiv2024

Comparison between $μ^{-}μ^{+}$ and $e^{-}e^{+}$ colliders for charged Higgs production in 2HDM

We study the phenomenology of the charged Higgs boson at future muon colliders. We investigate both the pair production $μ^+ μ^- \to H^+ H^-$, the single production $μ^+ μ^- \to W^\pm H^\mp$, as well as the Vector Boson Fusion (VBF) $\{e^+e^-, μ^+ μ^-\} \to ν\barν H^+ H^-$. We show that the neutral Higgs exchange diagrams in the muon collider case can lead to a significant boost in the cross sections through their Yukawa couplings. Our results for the muon collider are systematically compared to the corresponding ones at $e^+e^-$ machines. It is demonstrated that the vector boson fusion (VBF) $e^+e^- \to ν\barν H^+ H^-$ can compete with the mentioned $2\to 2$ processes. We select benchmark points and perform signal-background analyses, taking into account detector simulations. We demonstrate the discovery region at $5σ$ and the excluded region at $2σ$ levels at a 3 TeV muon collider.

hep-ph↗