Based on a dataset of (27.12 pm 0.10) x10^8 ψ(3686) events collected at the BESIII experiment, the absolute branching fractions of the three dominant Ω− decays are measured to be BΩ−→Ξ0π− = (25.03pm0.44pm0.53)%, BΩ−→Ξ−π0 = (8.43pm0.52pm0.28)%, and BΩ−→ΛK− = (66.3pm0.8pm2.0)%, where the first and second uncertainties are statistical and systematic, respectively. The ratio between BΩ−→Ξ0π− and BΩ−→Ξ−π0 is determined to be 2.97pm0.19pm0.11, which is in good agreement with the PDG value of 2.74pm0.15, but greater by more than four standard deviations than the theoretical prediction of 2 obtained from the ΔI = 1/2 rule.
Measurements of the absolute branching fractions of Ω− decays and test of the ΔI=1/2 rule
Garzia, I.;Gramigna, S.;
2023
Abstract
Based on a dataset of (27.12 pm 0.10) x10^8 ψ(3686) events collected at the BESIII experiment, the absolute branching fractions of the three dominant Ω− decays are measured to be BΩ−→Ξ0π− = (25.03pm0.44pm0.53)%, BΩ−→Ξ−π0 = (8.43pm0.52pm0.28)%, and BΩ−→ΛK− = (66.3pm0.8pm2.0)%, where the first and second uncertainties are statistical and systematic, respectively. The ratio between BΩ−→Ξ0π− and BΩ−→Ξ−π0 is determined to be 2.97pm0.19pm0.11, which is in good agreement with the PDG value of 2.74pm0.15, but greater by more than four standard deviations than the theoretical prediction of 2 obtained from the ΔI = 1/2 rule.File in questo prodotto:
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