arXiv subjects

Hai-Cat Tran

Publications and source records attributed to Hai-Cat Tran.

2 recordsLinked to original sources

arXiv2026

Detailed analysis of possible new-physics effects in the semileptonic decay $B_s \to D_s^{(*)}\tau\bar{\nu}$

We study the semileptonic decays $B_s \to D_s^{(*)}\tau\bar{\nu}$ as a promising probe for new physics (NP) beyond the standard model (SM). The extension of the SM is done through the introduction of four-fermion operators beyond the $V-A$ structure with the corresponding Wilson coefficients characterizing their contribution. The constraints on these coefficients are obtained from recent experimental data. Form factors describing hadron transitions are calculated in our covariant quark model with infrared confinement. Theoretical predictions for the full set of observables in these channels are provided. We analyze possible NP effects to be tested in future experiments.

hep-ph↗

arXiv2024

Study of the semileptonic decays $Υ(1S)\to B_{(c)}\ell\barν_\ell$

We study the exclusive semileptonic decays $Υ(1S)\to B_{(c)}\ell\barν_\ell$, where $\ell = e,μ,τ$. The relevant hadronic form factors are calculated using the Covariant Confined Quark Model developed previously by our group. We predict the branching fractions $\mathcal{B}(Υ(1S)\to B_{(c)}\ell\barν_\ell)$ to be of the order of $10^{-13}$ and $10^{-10}$ for the case of $B$ and $B_c$, respectively. Our predictions agree well with other theoretical calculations. We also consider the effects of possible New Physics in the case of $Υ(1S)\to B_cτ\barν_τ$. We show that the branching fraction of this decay can be enhanced by an order of magnitude using constraints from the $B\to D^{(*)}\ell\barν_\ell$ and $B_c\to J/ψ\ell \barν_\ell$ experimental data.

hep-ph↗