Measurement of the $$\sum {^ - \to ne^ - \bar v} $$ rate and search for Δ Q=−Δ S transitions in Σ→ ne ν decay.

In a bubble chamber experiment about 2×10 Σ-decays have been measured to separate Σ→ne¯ ν events from the two-body modes. No Σ →ne ν event was found whereas 607 Σ→ne¯ ν decays could be identified. The data yield for the Δ Q=−Δ S decay an upper limit: and the branching ratio: [ABSTRACT FROM AUTHOR]