Measurements of ψ(2S) decays to octet baryon-antibaryon pairs

With a sample of 14×106ψ(2S) events collected by the BESII detector at the Beijing Electron Positron Collider (BEPC), the decay channels ψ(2S)→B8B¯8(pp¯,ΛΛ¯,Σ0Σ¯0,Ξ−Ξ¯+) are measured, and their branching ratios are determined to be (3.36±0.09±0.25)×10−4, (3.39±0.20±0.32)×10−4, (2.35±0.36±0.32)×10−4, (3.03±0.40±0.32)×10−4, respectively. In the decay ψ(2S)→pp¯, the angular distribution parameter α is determined to be 0.85±0.24±0.04.