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 $2 - 3$.
Authors
Chien-Thang Tran
(Joint Institute for Nuclear Research; Moscow Institute of Physics and Technology)
Mikhail Ivanov
