Measurement of the Muon Decay Parameter delta

Details Measurement of the Muon Decay Parameter delta Measurement of the Muon Decay Parameter delta

2004-10-17

arxiv.org/abs/hep-ex/0410045v2

Phys.Rev.D71:071101,2005

Physics

High Energy Physics

High Energy Physics - Experiment

Extended to 5 pages. Referee's comments answered

Scientific paper

10.1103/PhysRevD.71.071101

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. It also has implications for left-right-symmetric and other extensions of the Standard Model.

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