The longitudinal polarization of the from 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 interaction.
- Received 8 May 1981
- Published in the issue dated 1 October 1981
© 1981 The American Physical Society