Abstract
The muon decay parameter has been measured by the TWIST collaboration. We find , consistent with the standard model value of . This result implies that the product of the muon polarization in pion decay, , and the muon decay parameter falls within the 90% confidence interval . It also has implications for left-right-symmetric and other extensions of the standard model.
- Received 17 October 2004
DOI:https://doi.org/10.1103/PhysRevD.71.071101
©2005 American Physical Society