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Studies in the BNL 21-GeV/c negative-hyperon beam. II. Leptonic decays of Ξ and Σ

J. A. Thompson, W. E. Cleland, W. E. Cooper, M. Dris*, E. Engels, Jr., M. L. Herbert†, and D. E. Kraus

D. Lowenstein

  • University of Pittsburgh, Pittsburgh, Pennsylvania 15260

  • Brookhaven National Laboratory, Upton, New York 11973

  • *Present address: Physics Department, University of Pennsylvania, Philadelphia, Pa. 19104.
  • †Present address: Singer Company, Kearfott Division, 150 Totowa Road, Wayne, New Jersey 07470.
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Phys. Rev. D 21, 25 – Published 1 January, 1980

DOI: https://doi.org/10.1103/PhysRevD.21.25

Abstract

The decays Σ−→Λe−ν and Ξ−→Λe−ν are studied in a counter—spark-chamber experiment using unpolarized hyperons from the BNL hyperon beam. A threshold Čerenkov counter identifies the electron. From a sample of 119 reconstructed Σ−→Λe−ν events (including ∼ 5 background events), we find (Σ−→Λe−ν)(Σ−→nπ)=(0.63±0.10)×10−4 and gVgA=−0.32±0.30, gWM=−0.6±3.6 (with sign convention of the Particle Data Group tables). We find Im(gVgA)=0.2±0.7, consistent with time-reversal invariance. From a sample of 14 Ξ−→Λe−ν events (including ≈ 3.4 background events) we find (Ξ−→Λe−ν)(Ξ−→Λπ)=(0.30±0.14)×10−3. We also searched for Ξ−→Λμν and Ξ−→Σ0eν and set upper limits on these decays from our data.

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Phys. Rev. D 21, 25– Published 1 January, 1980
  • Received 10 July 1979

© 1980 American Physical Society

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