Searcharxiv⌕ Search

arXiv subjects

Dzung Tri Tran

Publications and source records attributed to Dzung Tri Tran.

23 records · Page 2Linked to original sources
arXiv2021

One-loop $W$ boson contributions to the decay $H\rightarrow Zγ$ in the general $R_ξ$ gauge

One-loop $W$ boson contributions to the decay $H\rightarrow Zγ$ in the general $R_ξ$ gauge are presented. The analytical results are expressed in terms of well-known Passarino-Veltman functions which their numerical evaluations can be generated using {\tt LoopTools}. In the limit $d\rightarrow 4$, we have shown that these analytical results are independent of the unphysical parameter $ξ$ and consistent with previous results. The gauge parameter independence are also checked numerically for consistence. Our results are also well stable with different values of $ξ=0, 1, 100,$ and $ξ\rightarrow \infty$.

hep-ph↗
arXiv2021

General one-loop contributions to the decay $H\rightarrow ν_l\barν_lγ$

General one-loop contributions to the decay amplitudes $H\rightarrow ν_l\barν_lγ$ are presented, considering all possible contributions of additional heavy vector gauge bosons, fermions, and charged (and also neutral) scalar particles appearing in the loop diagrams. Moreover, the results can be applied directly when extra neutrinos (apart from three ones in standard model) are taken into account in final states. Analytic results are presented in terms of Passarino-Veltman scalar functions which can be evaluated numerically using {\tt LoopTools}. In the standard model framework, these analytical results are generated and cross-checked with previous computations. We find that our results are well consistent with these computations. Within standard model limit, phenomenological results for the decay channels are also studied using the updated input parameters at the Large Hadron Collider.

hep-ph↗
arXiv2021

One-loop form factors for $H\rightarrow γ^*γ^*$ in $R_ξ$ gauge

In this paper, we present general one-loop form factors for $H\rightarrow γ^* γ^*$ in $R_ξ$ gauge, considering all cases of two on-shell, one on-shell and two off-shell for final photons. The calculations are performed in standard model and in arbitrary beyond the standard models which charged scalar particles may be exchanged in one-loop diagrams. Analytic results for the form factors are shown in general forms which are expressed in terms of the Passarino-Veltman functions. We also confirm the results in previous computations which are available for the case of two on-shell photons. The $ξ$-independent of the result is also discussed. We find that numerical results are good stability with varying $ξ=0,1$ and $ξ\rightarrow \infty$.

hep-ph↗
arXiv2020

Hypergeometric presentation for one-loop contributing to $H\rightarrow Zγ$

In this paper, new analytic formulas for one-loop contributing to Higgs decay channel $H \rightarrow Zγ$ are presented in terms of hypergeometric functions. The calculations are performed by following the technique for tensor one-loop reduction developed in [A.~I.~Davydychev, Phys.\ Lett.\ B {\bf 263} (1991) 107]. For the first time, one-loop form factors for the decay process are shown which are valid at arbitrary space-time dimension $d$.

hep-ph↗
arXiv2019

One-loop three-point Feynman integrals with Appell $F_1$ hypergeometric functions

New analytic formulas for one-loop three-point Feynman integrals in general space-time dimension ($d$) are presented in this paper. The calculations are performed at general configurations for internal masses and external momenta. The analytic results are expressed in terms of hypergeometric series $_2F_1$, $_3F_2$ for special cases and Appell $F_1$ for general cases. Furthermore, we cross-check our analytic results with other references which have carried out the integrals in several special cases.

hep-ph↗