Form Factors and semileptonic decay of $D_s^{+}\to \varphi \bar{\ell }\nu$ from QCD sum rule

Abstract

We calculate $D_s^{+}\to \varphi$ transition form factors $V$, $A_0$, $A_1$ and $A_2$, and study semileptonic decay of $D_s^{+}\to \varphi \bar{\ell }\nu$ based on QCD sum rule method. We compare our results of the ratios of $V(0)/A_1(0)$, $A_2(0)/A_1(0)$, ${\Gamma }_L/{\Gamma }_T$, and the total decay branching ratio of $D_s^{+}\to \varphi \bar{\ell }\nu$ with experimental data, and find that they are consistent.

Comments: version to appear in Eur.Phys.J.C