Measurement of P_{mu}xi in Polarized Muon Decay (2006)
Jamieson, TWIST Collaboration: B., Bayes, R., Davydov, Yu. I., Depommier, P., Doornbos, J., Faszer, W., ...
The quantity P_{mu}^{pi}xi, where xi is one of the muon decay parameters and $P_{\mu}^{\pi}$ is the degree of muon polarization in pion decay, has been measured. The value P_{mu}^{pi}xi = 1.0003 +-...