Precise measurement of parity violation in polarized muon decay

Details Precise measurement of parity violation in polarized muon decay Precise measurement of parity violation in polarized muon decay

2011-04-19

arxiv.org/abs/1104.3632v2

Phys.Rev.D84:032005,2011

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 12 figures, published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.032005

We present a new high precision measurement of parity violation in the weak interaction, using polarized muon decay. The TWIST collaboration has measured $P_\mu^\pi \xi$, where $P_\mu^\pi$ is the polarization of the muon in pion decay and $\xi$ describes the intrinsic asymmetry in muon decay. We find $P_\mu^\pi \xi = 1.00084 \pm 0.00029\,(\textrm{stat.})_{-0.00063}^{+0.00165}\,(\textrm{syst.})$, in good agreement with the standard model prediction of $P_\mu^\pi=\xi=1$. 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.

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