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DOI: 10.1103/PhysRevD.106.112007

Observation of the $J/\psi$ and $\psi(3686)$ decays into $\eta\Sigma^{+}\bar{\Sigma}^{-}$

BESIII Collaboration: M. AblikimM. N. AchasovP. Adlarson ...+579 J. Zu
Oct 2022
摘要
The decays $J/\psi\to\eta\Sigma^{+}\bar{\Sigma}{}^-$ and$\psi(3686)\to\eta\Sigma^{+}\bar{\Sigma}{}^-$ are observed for the first time,using $(10087 \pm 44)\times 10^{6}$ $J/\psi$ and $(448.1 \pm 2.9)\times 10^{6}$$\psi(3686)$ events collected with the BESIII detector at the BEPCII collider.We determine the branching fractions of these two decays to be ${\calB}(J/\psi\to\eta\Sigma^{+}\bar{\Sigma}{}^-)=(6.34 \pm 0.21 \pm 0.37)\times10^{-5}$ and ${\cal B}(\psi(3686)\to\eta\Sigma^{+}\bar{\Sigma}{}^-)=(9.59 \pm2.37 \pm 0.61)\times 10^{-6}$, where the first uncertainties are statisticaland the second are systematic. The ratio of these two branching fractions isdetermined to be $\frac{{\calB}(\psi(3686)\to\eta\Sigma^{+}\bar{\Sigma}{}^-)}{{\calB}(J/\psi\to\eta\Sigma^{+}\bar{\Sigma}{}^-)}=(15.1 \pm 3.8)\%$, which is inagreement with the "12\% rule."
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