ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Approximately 106 Σ± decays of the stopping K− film (80 cm Saclay HBC) have been measured with the Heidelberg KONRAD-system1. This system is capable of detecting about 75% of the Σ−→ ne−¯v decays. In addition, about 106 pictures have been scanned for Σ± leptonic decays with secondary particle momenta below 80 MeV/c. This covers about 15% of the lepton spectrum. The data yield the following branching ratios: (1) $$\frac{{\Gamma \left( {\sum ^ - \to ne^ - \bar v} \right)}}{{\Gamma \left( {\sum ^ - \to \pi ^ - n} \right)}} = \left( {1.02 \pm 0.08} \right) \times 10^{ - 3} ,$$ (2) $$\frac{{\Gamma \left( {\sum ^ - \to n\mu ^ - \bar v} \right)}}{{\Gamma \left( {\sum ^ - \to \pi ^ - n} \right)}} = \left( {0.43 \pm 0.06} \right) \times 10^{ - 3} .$$ Since only a part of the lepton spectra is detected, the branching ratios depend slightly on the form of the transition matrix elements. The values quoted above were derived taking the Cabibbo solution2 g1/f1=−0.24 and the CVC prediction f2/f1=−1.143. The branching ratios are in good agreement withμ, e universality.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01392973
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