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N. T. Tham

Publications and source records attributed to N. T. Tham.

4 recordsLinked to original sources
arXiv2026

LFV decays in a 3-3-1 model with singlet leptoquarks

Motivated by a recent study of the 3-3-1 model supplemented with a singlet scalar leptoquark, which successfully explains the muon anomalous magnetic moment and the decay $μ\to eγ$ within current experimental constraints, we extend the phenomenological analysis of this framework to include the lepton-flavor-violating decays of the Standard Model-like Higgs and the $Z$ boson. An interesting feature is that the branching ratios of these decays exhibit a nearly linear correlation with the corresponding charged lepton flavor-violating radiative decays, namely $\mathrm{Br}(h,Z\to e_b^\pm e_a^\mp)\propto\mathrm{Br}(e_b\to e_aγ)$. Furthermore, the model exhibits a complementary interplay between the charged-lepton anomalous magnetic moments: parameter regions with $|Δa_μ|\geq10^{-11}$ favor $\mathrm{Br}(h,Z\toτ^\pmμ^\mp)$ reaching their current experimental upper limits while keeping $|Δa_e|$ negligible, whereas regions with $10^{-14}\leq|Δa_e|\leq 8\times10^{-13}$ instead allow $\mathrm{Br}(h,Z\toτ^\pm e^\mp)$ to approach the present experimental sensitivities but simultaneously suppress $|Δa_μ|$ to the level of $\mathcal{O}(10^{-16})$.

hep-ph↗
arXiv2023

Investigation of CP-even Higgs bosons decays $H \rightarrow μτ$ within constraints of $l_a \rightarrow l_b γ$ in a 3-3-1 model with inverse seesaw neutrinos

In a 3-3-1 model with inverse seesaw neutrinos, we use a simple form of Higgs potential to give four CP-even Higgs bosons ($H \equiv h^0_1,h^0_2,h^0_3,h^0_4$). We investigate $H \rightarrow μτ$ decays in the parameter space regions satisfying the experimental limits of $l_a \rightarrow l_b γ$ with running parameters being the mass of the charged Higgs boson ($m_{H_1^\pm}$) and the mixing matrix of the heavy neutrinos ($M_R$). We show that there exist regions of parameter space where all partial widths $Γ(H \rightarrow μτ)$ are less than the current experimental limit ($4.1 \times 10^{-6} GeV$). Analyzing the contributing components to $Γ(H \rightarrow μτ)$, we also compare the mass of the SM-like Higgs boson with the corresponding ones of the other CP-even Higgs bosons in this model.

hep-ph↗
arXiv2021

Contribution of heavy neutrinos to decay of standard-model-like Higgs boson $h\rightarrow μτ$ in a 3-3-1 model with additional gauge singlets

In the framework of the improved version of the 3-3-1 models with right-handed neutrinos, which is added to the Majorana neutrinos as new gauge singlets, the recent experimental neutrino oscillation data is completely explained through the inverse seesaw mechanism. We show that the major contributions to $Br(μ\rightarrow eγ)$ are derived from corrections at 1-loop order of heavy neutrinos and bosons. But, these contributions are sometimes mutually destructive, creating regions of parametric spaces where the experimental limits of $Br(μ\rightarrow eγ)$ are satisfied. In these regions, we find that $Br(τ\rightarrow μγ)$ can achieve values of $10 ^{- 10}$ and $Br(τ\rightarrow eγ)$ may even reach values of $10 ^{- 9}$ very close to the upper bound of the current experimental limits. Those are ideal areas to study lepton-flavor-violating decays of the standard- model- like Higgs boson ($h_1^0$). We also pointed out that the contributions of heavy neutrinos play an important role to change $Br(h_1^0\rightarrow μτ)$, this is presented through different forms of mass mixing matrices ($M_R$) of heavy neutrinos. When $M_R \sim diag(1,1,1)$, $Br(h_1^0\rightarrow μτ)$ can get a greater value than the cases $M_R \sim diag(1,2,3)$ and $M_R \sim diag(3,2,1)$ and the largest that $Br(h_1^0\rightarrow μτ)$ can reach is very close $10 ^{-3}$.

hep-ph↗