Abstract
Using a data sample of $(448.1\pm2.9)\times 10^6~\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays $\chi_{cJ} \rightarrow \Sigma^+ \bar{\Sigma}^-$ and $\Sigma^0 \bar{\Sigma}^0$. The decays $\chi_{c1,2}\rightarrow \Sigma^+ \bar{\Sigma}^-$ and $\Sigma^0 \bar{\Sigma}^0$ are observed for the first time, and the branching fractions for $\chi_{c0}\rightarrow \Sigma^+ \bar{\Sigma}^-$ and $\Sigma^0 \bar{\Sigma}^0$ decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.
Highlights
Experimental studies of charmonium decays can test calculations in quantum chromodynamics (QCD) and QCD based effective field theories
Using a data sample of ð448.1 Æ 2.9Þ × 106 ψð3686Þ events collected with the BESIII detector at the Beijing electron positron collider II (BEPCII) collider, we present measurements of branching fractions for the decays χcJ → ΣþΣ − and Σ0Σ 0
(BF) of χc0 → ΣþΣ − and Σ0Σ 0 decays as measured by CLEO-c [5] and BESIII [6] are observed to violate the helicity selection rule from perturbative QCD [7,8,9] and do not agree with models based on the charm meson loop mechanism [3,10,11]
Summary
Experimental studies of charmonium decays can test calculations in quantum chromodynamics (QCD) and QCD based effective field theories. (BF) of χc0 → ΣþΣ − and Σ0Σ 0 decays as measured by CLEO-c [5] and BESIII [6] are observed to violate the helicity selection rule from perturbative QCD (pQCD) [7,8,9] and do not agree with models based on the charm meson loop mechanism [3,10,11]. The χcJ (J 1⁄4 0, 1, 2) states are identified as the charmonium P-wave spin triplet. They cannot be produced directly in the annihilation of electrons with positrons, the radiative decays of the ψð3686Þ meson can generate large numbers of these particles. The isospin symmetry is tested using the BF ratios between the charged and neutral modes
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