Measurement of the Λ→p μ− ¯v branching ratio |
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Authors: | M Baggett N Baggett F Eisele H Filthuth H Frehse V Hepp R Howard E Leitner |
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Institution: | 1. Institut für Hochenergiephysik der Universit?t Heidelberg, Deutschland 3. CERN, Geneva, Switzerland
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Abstract: | A sample of 1.2× 106 Λ-hyperons was analyzed in order to detect the rare decay mode: Λ →pμ?¯v. The Λ-hyperons were produced by stoppingK ?-mesons in the 81 cm Saclay hydrogen bubble chamber at the CERN PS. We obtained for the branching ratio: $$\frac{{\Gamma {\text{(}}\Lambda \to p\mu ^ - \bar \nu )}}{{\Gamma {\text{(}}\Lambda \to {\text{all)}}}} = (1.4 \pm 0.5) \times 10^{ - 4} ,$$ based on 20 events, of which 6 have to be attributed to the background from the reaction $$\Lambda \to p\pi ^ - , \pi ^ - \to \mu ^ - \bar v.$$ The background was determined by a Monte Carlo calculation. |
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