Abstract
The results of a counter experiment on the branching ratioR=Γ(ω→neutrals)/Γ(ω→total) are presented. The masses of particles produced in the reaction π− + p → n + (missing mass) at 2.12 GeV/c were determined with an uncertainty of ±15 MeV by using counter techniques to measure the time of flight and emission angle of the neutrons. Veto counters around the hydrogen target selected neutral decay modes. The peak values of ω/background were 0.4 for the neutral mode and 0.55 for the total decay. Corrections to the experimental value are discussed. The value of the branching ratio was found to be (8.4±1.5)%. This result is compared with various theoretical predictions.
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