International Conference on Precision Physics and Fundamental Physical Constants (FFK-2015)

12-16 October 2015
Hungarian Academy of Sciences
Europe/Budapest timezone

The exclusive decays J/psi to D_s*- l+ nu_l in a covariant constituent quark model with infrared confinement

Oct 15, 2015, 10:10 AM
25m
Kis terem (Small conference room) (Hungarian Academy of Sciences)

Kis terem (Small conference room)

Hungarian Academy of Sciences

1051 Budapest, Széchenyi tér 9.

Speaker

Chien-Thang Tran (Joint Institute for Nuclear Research; Moscow Institute of Physics and Technology)

Description

We investigate the exclusive semileptonic decays $J/\psi \to D_{(s)}^{(*)-} {\ell}^+ \nu_{\ell}$\,, where $\ell=e,\mu$, within the Standart Model. The relevant transition form factors are calculated in the framework of a relativistic constituent quark model with built-in infrared confinement. Our calculations predict the branching fractions $\mathcal{B}(J/\psi \to D_{(s)}^{(*)-} {\ell}^+ \nu_{\ell})$ to be of the order of $10^{-10}$ for $D_s^{(*)-}$ and $10^{-11}$ for $D^{(*)-}$. Most of our numerical results are consistent with other theoretical studies. However, some branching fractions are larger than those calculated in QCD sum rules approaches but smaller than those obtained in the covariant light-front quark model by a factor of about $2 - 3$.

Primary authors

Chien-Thang Tran (Joint Institute for Nuclear Research; Moscow Institute of Physics and Technology) Mikhail Ivanov