Weak Decays of $J/\psi$ and $\Upsilon(1S)$

TL;DR

This study investigates the weak decay processes of $J/$ and $(1S)$ mesons using the Bethe-Salpeter method, revealing new form factors that influence decay rates and providing detailed branching ratio estimates.

Contribution

The paper introduces two new form factors, $h_1$ and $h_2$, in the analysis of $1^- o 1^-$ decays, which significantly impact decay rate calculations.

Findings

New form factors $h_1$ and $h_2$ affect decay rates by 3-14%.

Largest semi-leptonic branching ratios are around 10^{-10}.

Non-leptonic decay branching ratios are around 10^{-9} for $J/\psi$.

Abstract

In this paper we study the weak decays of $J/\psi$ and $\Upsilon(1S)$. 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 $3\%\sim6\%$ and $2\%\sim14\%$, 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 $\Upsilon(1S)$ decays, and the largest branching ratios of non-leptonic decays are of the order of $10^{-9}$ for $J/\psi$ and $10^{-10}$ for $\Upsilon(1S)$.