Pseudoscalar-meson decay constants and weak form factors in a relativistic quark model

Abstract

Pseudoscalar-meson decay constants and weak form factors are studied on the basis of a relativistic quark model, where the quark-antiquark system with unequal masses is treated in the framework of ladder approximation. $\frac{{f}_{K}}{{f}_{\ensuremath{\pi}}}=1.25$ and $\frac{{f}_{K}}{{f}_{\ensuremath{\pi}}}{f}_{+}^{K\ensuremath{\pi}}(0)=1.27$ are obtained. Decay constants and form factors for charmed mesons are also predicted.