Phys. Rev. D 84, 032005 (2011) [18 pages]Precise measurement of parity violation in polarized muon decay
We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST Collaboration has measured Pμπξ, where Pμπ is the polarization of the muon in pion decay and ξ describes the intrinsic asymmetry in muon decay. We find Pμπξ=1.000 84±0.000 29(stat.)-0.000 63+0.001 65(syst.), in good agreement with the standard model prediction of Pμπ=ξ=1. Our result is a factor of 7 more precise than the pre-TWIST value, setting new limits in left-right symmetric electroweak extensions to the standard model. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Published by the American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.84.032005
DOI:
10.1103/PhysRevD.84.032005
PACS:
13.35.Bv, 12.60.Cn, 14.60.Ef
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