Summary
The branching ratioR=Γ(η→neutrals)/Γ(η→total) has been measured with counter techniques. The η-mesons were produced in the reaction π−+p→ n+MM at 0.8 GeV/c. A total of ∼24 000 η-events have been observed. The value found isR=(70.5±0.8)%. The 90% confidence level for the branching ratioR’=Γ(η→π0 γγ)/Γη→→ total is found to beR′≦10%.
Riassunto
Studiando la reazione π−+p→ n+MM a 0.8 GeV/c sono stati osservati circa 24 000 mesoni η, ed è stata ottenuta una nuova misura accurata del «branching ratio»,R=Γ(η→neutri)/Γ(η→totale)=(70.5±0.8)%.
Резюме
С помощью счетчиков было измерено отношение ветвей распадовR=Г(η→нейтральные)/Г(η→полный). η мезоны рождались в реакции π−+p→ n+MM при 0.8 ГэB/c. Было наблюдено полное число η-событий ∼24 000. Измеренная величинаR составляетR=(70.5±0.8)%.
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Basile, M., Bollini, D., Dalpiaz, P. et al. An accurate measurement of the branching ratio η→neutrals/η→total. Nuov Cim A 3, 796–806 (1971). https://doi.org/10.1007/BF02813579
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DOI: https://doi.org/10.1007/BF02813579