Phys. Rev. D 71, 071101(R) (2005) [5 pages]Measurement of the muon decay parameter δ
The muon decay parameter δ has been measured by the TWIST collaboration. We find δ=0.74964±0.00066(stat.)±0.00112(syst.), consistent with the standard model value of 3/4. This result implies that the product Pμξ of the muon polarization in pion decay, Pμ, and the muon decay parameter ξ falls within the 90% confidence interval 0.9960<Pμξ≤ξ<1.0040. It also has implications for left-right-symmetric and other extensions of the standard model. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.071101
DOI:
10.1103/PhysRevD.71.071101
PACS:
13.35.Bv, 12.60.Cn, 14.60.Ef
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