arXiv subjects

B. Ait Ouazghour

Publications and source records attributed to B. Ait Ouazghour.

3 recordsLinked to original sources

arXiv2024

Higgs photon associated production in a Two Higgs Doublet Type-II Seesaw Model at future electron-positron colliders

We study the one-loop prediction for the single production of a SM-like Higgs boson in association with a photon in electron-positron collisions in the context of the two Higgs doublet type-II seesaw model ($2HDMcT$). We explore to what extent the new scalars in the $2HDMcT$ spectrum affect its production cross-section, the ratio $R_{γh_1}$ as well as the signal strengths $R_{γZ}$ and $R_{γγ}$ when $h_1$ is identified with the observed $SM$ Higgs boson within the $2HDMcT$ delimited parameter space. More specifically, we focus on $e^+e^- \to h_1γ$ process at one-loop, and analyzed how it evolves under a full set of theoretical constraints and the available experimental data, including $B\to X_sγ$ limit at 95$\%$ C.L. Our analysis shows that these observables are strongly dependent on the parameters of the model, especially the mixing angel $α_1$, the potential parameters $λ_{7}$, $λ_{9}$, the trilinear Higgs couplings, with a noticeable sensitivity to $α_1$. We found that $σ(e^+e^- \to h_1γ)$ can significantly be enhanced up to $8.1\,\,\times 10^{-2}$ fb, thus exceeding the Standard Model prediction. Additionally, as a byproduct, we also observed that $R_{γh_1}$ is entirely correlated with both the $h_1\toγγ$ and $h_1\toγZ$ signal strengths.

hep-ph↗

arXiv2023

The two Higgs doublet type-II seesaw model: Naturalness and $\bar{B}\to X_sγ$ versus heavy Higgs masses

We extend the work \cite{Ouazghour:2018mld} to a more general and detailed analysis through studying the naturalness problem and $B$ physics constraints within the context of two higgs doublets model augmented with a complex scalar triplet field ($2HDMcT$). We first derive the modified Vetman conditions and show that naturalness problem might be evaded at the electroweak scale. Then, we evaluate the branching ratio of $\bar{B}\to X_sγ$ radiative decay at the Next to leading order. Besides unitarity, boundedness from below constraints and the present collider data from Higgs signal rate measurements, the parameter space of $2HDMcT$ is then revisited to see how the modified Veltman conditions and $\bar{B}\to X_sγ$ experimental bounds induce significant delimitations. Our analysis shows that the naturalness affects drastically the masses of heavy Higgs $h_3$, $A_2$, $H_2^\pm$ and $H^{\pm\pm}$. More specifically, we considered three benchmak scenarios corresponding to $μ_2 > 20, 40, 70$ GeV. For $μ_2 > 40$, we find stringent upper limits on $m_{h_2}$, $m_{A_1}$ and $m_{H_1^\pm}$ at $880$, $920$ and $918$ GeV respectively. If, in addition, the measurements of $\bar{B}\to X_sγ$ decay rate are also considered, the lower masses limits of nonstandard Higgs bosons ($h_2$, $h_3$, $A_1$, $A_2$, $H_1^\pm$, $H_2^\pm$, $H^{\pm\pm}$) are pushed up to higher values located between $490$ and $750$ GeV. Besides, we also demonstrate that the $\bar{B}\to X_sγ$ experimental limits can only be accommodated within $2HDMcT$ if two conditions are fullfilled : $α_1$ parameter positive and the Higgs mass hierarchy $m_{h_{3}}>m_{H_2^\pm}>m_{H^{\pm\pm}}$.

hep-ph↗

arXiv2023

Consistency of New CDF-II W Boson Mass with 123-Model

Following the recent update measurement of the W boson mass performed by the CDF-II experiment at Fermilab which indicates $7σ$ deviation from the SM prediction. As a consequence, the open question is whether there are extensions of the SM that can carry such a remarkable deviation or what phenomenological repercussions this has. In this paper, we investigate what the theoretical constraints reveal about the \ott model. Also, we study the consistency of a CDF W boson mass measurement with the 123-model expectations, taking into account theoretical and experimental constraints. Both fit results of $S$ and $T$ parameters before and after $m_{W}^{\rm{CDF}}$ measurement are, moreover, considered in this study. Under these conditions, we found that the 123-model prediction is consistent with the measured $m_{W}^{\rm{CDF}}$ at a $95\%$ Confidence Level (CL).

hep-ph↗