Measurements of baryon pair decays of χcJ mesons

Abstract

Using 106×106 ψ′ decays collected with the BESIII detector at the BEPCII, three decays of χcJ (J=0, 1, 2) with baryon pairs (ΛΛ̄, Σ0Σ̄0, Σ+Σ̄-) in the final state have been studied. The branching fractions are measured to be B(χ c0,1,2→ΛΛ̄)=(33.3±2.0±2.6) ×10-5, (12.2±1.1±1.1)×10-5, (20.8±1.6±2.3)×10-5; B(χ c0,1,2→Σ0Σ̄0)=(47.8±3. 4±3.9)×10-5, (3.8±1.0±0.5)×10 -5, (4.0±1.1±0.5)×10-5; and B(χc0,1,2→Σ+Σ̄ -)=(45.4±4.2±3.0)×10-5, (5.4±1.5±0.5)×10-5, (4.9±1.9±0.7) ×10-5, where the first error is statistical and the second is systematic. Upper limits on the branching fractions for the decays of χc1,2→Σ0Σ̄0, Σ+Σ̄- are estimated to be B(χc1→Σ0Σ̄0)<6. 2×10-5, B(χc2→Σ0Σ ̄0)<6.5×10-5, B(χ c1→Σ+Σ̄ -)<8.7×10-5 and B(χc2→Σ +Σ̄-)<8.8×10-5 at the 90% confidence level. © 2013 American Physical Society.