Improved measurements of $χ_{cJ} \rightarrow Σ^+ \barΣ^-$ and $Σ^0 \barΣ^0$ decays

Abstract

Using a data sample of $(448.1\pm2.9)\times 10^6~ψ(3686)$ events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays $χ_{cJ} \rightarrow Σ^+ \barΣ^-$ and $Σ^0 \barΣ^0$. The decays $χ_{c1,2}\rightarrow Σ^+ \barΣ^-$ and $Σ^0 \barΣ^0$ are observed for the first time, and the branching fractions for $χ_{c0}\rightarrow Σ^+ \barΣ^-$ and $Σ^0 \barΣ^0$ decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.

9 pages, 4 figures; Accepted by PRD