Search for ∆S = 2 nonleptonic hyperon decays Ω− → Σ0π− and Ω− → nK−

A bstract Using (27 . 12 ± 0 . 14) × 10 8 ψ (3686) events collected by the BESIII detector at the center-of-mass energy of √s s = 3 . 686 GeV, we search for the first time for two nonleptonic hyperon decays that change strangeness by two units, Ω − → Σ 0 π − and Ω − → nK − . No significant signal is observed. The upper limits on their decay branching fractions are determined to be B B (Ω − → Σ 0 π − ) < 5 . 4 × 10 − 4 and B B (Ω − → nK − ) < 2 . 4 × 10 − 4 at the 90% confidence level.