Using 1310.6 × 10^6 J/ψ and 447.9 × 106 ψ(3686) events collected with the BESIII detector at the BEPCII e+e− collider, the branching fractions and the angular distributions of J/ψ and ψ(3686) decays to ΛΛbar and Σ0Σ0bar final states are measured. The branching fractions are determined, with much improved precision, to be 19.43 +- 0.03 +- 0.33, 11.64 +- 0.04 +- 0.23, 3.97 +- 0.02 +- 0.12 and 2.44 +- 0.03 +- 0.11 for J/ψ → ΛΛbar, J/ψ → Σ0Σ0bar, ψ(3686) → ΛΛbar and ψ(3686) → Σ0Σ0bar, respectively. The polar angular distributions of ψ(3686) decays are measured for the first time, while those of J/ψ decays are measured with much improved precision. In addition, the ratios of branching fractions B((ψ3686)→ΛΛbar) / B(J/ψ → ΛΛbar) and B(ψ(3686)→Σ0Σ0bar)/B(J/ψ→Σ0Σ0bar) are determined to test the “12% rule.”
Study of J/ψ and ψ(3686) decay to ΛΛ¯ and Σ0Σ¯0 final states
FARINELLI, Riccardo;GARZIA, Isabella;MEZZADRI, Giulio;
2017
Abstract
Using 1310.6 × 10^6 J/ψ and 447.9 × 106 ψ(3686) events collected with the BESIII detector at the BEPCII e+e− collider, the branching fractions and the angular distributions of J/ψ and ψ(3686) decays to ΛΛbar and Σ0Σ0bar final states are measured. The branching fractions are determined, with much improved precision, to be 19.43 +- 0.03 +- 0.33, 11.64 +- 0.04 +- 0.23, 3.97 +- 0.02 +- 0.12 and 2.44 +- 0.03 +- 0.11 for J/ψ → ΛΛbar, J/ψ → Σ0Σ0bar, ψ(3686) → ΛΛbar and ψ(3686) → Σ0Σ0bar, respectively. The polar angular distributions of ψ(3686) decays are measured for the first time, while those of J/ψ decays are measured with much improved precision. In addition, the ratios of branching fractions B((ψ3686)→ΛΛbar) / B(J/ψ → ΛΛbar) and B(ψ(3686)→Σ0Σ0bar)/B(J/ψ→Σ0Σ0bar) are determined to test the “12% rule.”I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.