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Measurement of the positron longitudinal polarization in muon decay

Phys. Rev. D 24, 2004(R) – Published 1 October 1981
F. Corriveau, J. Egger, W. Fetscher, H. -J. Gerber, K. F. Johnson, H. J. Mahler, M. Salzmann, H. Kaspar, and F. Scheck


The longitudinal polarization of the e+ from μ+ decay has been measured. The spin dependence of positron-electron (Bhabha) scattering and of annihilation in flight were used as the analyzing reactions. The combined statistical and systematic error was reduced by a factor of approximately 3 below that of any previous measurement. The longitudinal polarization was found to be 1.010±0.064 (statistical plus systematic error) and to be consistent with the prediction of the V-A interaction.

DOI: http://dx.doi.org/10.1103/PhysRevD.24.2004

  • Received 8 May 1981
  • Published in the issue dated 1 October 1981

© 1981 The American Physical Society

Authors & Affiliations

F. Corriveau, J. Egger*, W. Fetscher, H. -J. Gerber, K. F. Johnson, H. J. Mahler, and M. Salzmann*

  • Laboratorium für Hochenergiephysik Eidgenossische Technische Hochschule Zurich, CH-5234 Villigen, Switzerland

H. Kaspar

  • Schweizerisches Institut für Nuklearforschung (SIN), CH-5234 Villigen, Switzerland

F. Scheck

  • Johannes-Gutenberg-Universität, D-6500 Mainz, Federal Republic of Germany

  • *Present address: Schweizerisches Institut für Nuklearforschung (SIN), CH-5234 Villigen, Switzerland.
  • Present address: Physics Department, University of California at Irvine, Irvine, Calif. 92717.

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