Measurements of the absolute branching fractions of ω- Decays and test of the Δi=1/2 rule

Abstract

Based on a dataset of (27.12±0.10)×108 ψ(3686) events collected at the BESIII experiment, the absolute branching fractions of the three dominant ω- decays are measured to be Bω-→Ξ0π-=(25.03±0.44±0.53)%, Bω-→Ξ-π0=(8.43±0.52±0.28)%, and Bω-→ΛK-=(66.3±0.8±2.0)%, where the first and second uncertainties are statistical and systematic, respectively. The ratio between Bω-→Ξ0π- and Bω-→Ξ-π0 is determined to be 2.97±0.19±0.11, which is in good agreement with the PDG value of 2.74±0.15, but greater by more than four standard deviations than the theoretical prediction of 2 obtained from the ΔI=1/2 rule.