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24 April 2024

» arxiv » 1104.3632

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Precise measurement of parity violation in polarized muon decay
TWIST Collaboration ; J.F. Bueno ; R. Bayes ; Yu.I. Davydov ; P. Depommier ; W. Faszer ; C.A. Gagliardi ; A. Gaponenko ; D.R. Gill ; A. Grossheim ; P. Gumplinger ; M.D. Hasinoff ; R.S. Henderson ; A. Hillairet ; J. Hu ; D.D. Koetke ; R.P. MacDonald ; G.M. Marshall ; E.L. Mathie ; R.E. Mischke ; K. Olchanski ; A. Olin ; R. Openshaw ; J.-M. Poutissou ; R. Poutissou ; V. Selivanov ; G. Sheffer ; B. Shin ; T.D.S. Stanislaus ; R. Tacik ; R.E. Tribble ;
Date:	19 Apr 2011
Abstract:	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 $P_mu^pi xi = 1.00084 pm 0.00029,( extrm{stat.})_{-0.00063}^{+0.00165},( extrm{syst.})$, in good agreement with the standard model prediction of $P_mu^pi=xi=1$. Our result is a factor of seven more precise than the pre-TWIST value, setting new limits in left-right symmetric electroweak extensions to the standard model.
Source:	arXiv, 1104.3632
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