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MacDonald, R. Poutissou, R.S. Henderson, R. Tacik, T.A. Porcelli, T.D.S. Stanislaus, TWIST Collaboration: A. Gaponenko, V.D. Torokhov, V. Selivanov, W. Faszer, Yu.I. Davydov, Yu.Yu. Lachin","submitted_at":"2004-10-17T21:08:49Z","abstract_excerpt":"The muon decay parameter delta has been measured by the TWIST collaboration. We find delta = 0.74964 +- 0.00066(stat.) +- 0.00112(syst.), consistent with the Standard Model value of 3/4. This result implies that the product Pmuxi of the muon polarization in pion decay, Pmu, and the muon decay parameter xi falls within the 90% confidence interval 0.9960 < Pmuxi < xi < 1.0040. 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