Precise measurement of parity violation in polarized muon decay
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We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST Collaboration has measured P, where P is the polarization of the muon in pion decay and describes the intrinsic asymmetry in muon decay. We find P=1.000840.00029(stat.)-0.00063+0.00165(syst.), in good agreement with the standard model prediction of P==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. 2011 American Physical Society.