Estimation of coupling constants for D-meson, charmed, and light baryons in effective Lagrangian approach and quark model

Abstract

We estimate coupling constants for effective Lagrangians of $D$-meson, charmed, and light baryons from charmed baryon decay processes. First, we calculate decay widths for the processes $\hat{I}{›}_c\to DN$, $\hat{I}{\pounds }_c\to D\hat{I}”$, $\hat{I}{\pounds }_c\to D^{\ast }\hat{I}”$, and $\hat{I}{›}_c\to D^{\ast }N$ in effective Lagrangian method and quark model picture with ${}^3{P}_0$ model. By employing the coupling constants for $D^{\ast }\hat{I}{›}_{c}N$ interaction from several literatures, the strength parameter $\hat{I}»$ for ${}^3{P}_0$ quark model is fixed in the decay process $\hat{I}{›}_c\to D^{\ast }N$. Then, the coupling constants for the effective Lagrangians of $D\hat{I}{›}_{c}N$, $D\hat{I}{\pounds }_c\hat{I}”$, and $D^{\ast }\hat{I}{\pounds }_c\hat{I}”$ interactions are estimated in the decay channels $\hat{I}{›}_c\to DN$, $\hat{I}{\pounds }_c\to D\hat{I}”$, and $\hat{I}{\pounds }_c\to D^{\ast }\hat{I}”$, respectively. These coupling constants will be useful for further studies of charm hadrons.

5 pages, 2 figures