Current s-Quark Mass Corrections to the Form Factors of D-Meson Semileptonic Decays

Abstract

The infinite mass effective theory, when a heavy quark mass tends to infinity, and Chiral perturbation theory at the quark level, based on the extended Nambu -- Jona -- Lasinio model with linear realization of chiral $U(3)\times U(3)$ symmetry, are applied to the calculation of current $s$ -- quark mass corrections to the form factors of the $D\to \bar{K}{e}^{+}{\nu }_e$ and $D\to {\bar{K}}^{\ast }{e}^{+}{\nu }_e$ decays. These corrections turn out to be quite significant, of the order of $7-20\%$. The theoretical results are compared with experimental data.

Comments: 9 pages, latex, no figures, accepted for publication in Phys. Lett. B