Weak Decays of $J/\psi$ and ${\rm Y}(1S)$

Abstract

In this paper we study the weak decays of $J/\psi$ and ${\rm Y}(1S)$. Using the Bethe-Salpeter method, we calculate the hadronic transition amplitude and give the form factors. We find that two new form factors $h_1$ and $h_2$, which do not appear in existing literature, have contributions in $1^{-}\to 1^{-}$ decays. They affect the branching ratios of semi-leptonic and non-leptonic decays by the rate of $3\%\sim 6\%$ and $2\%\sim 14\%$, respectively, so their contributions can not be ignored and should be considered. Our results show that, for the semi-leptonic decay modes, the largest branching ratios are of the order of $10^{-10}$ both for $J/\psi$ and ${\rm Y}(1S)$ decays, and the largest branching ratios of non-leptonic decays are of the order of $10^{-9}$ for $J/\psi$ and $10^{-10}$ for ${\rm Y}(1S)$.

Comments: 26 pages, 12 figures, 17 tables