Precision measurement of the muon decay parameters p and δ

  title={Precision measurement of the muon decay parameters p and δ},
  author={Twist Collaboration R.P. MacDonald and R. Bayes and J. Bueno and Y. Davydov and P. Depommier and W. Faszer and M. Fujiwara and C. Gagliardi and A. Gaponenko and D. Gill and A. Grossheim and P. Gumplinger and M. Hasinoff and R. Henderson and A. Hillairet and J. Hu and B. Jamieson and P. Kitching and D. Koetke and G. M. Marshall and E. Mathie and R. Mischke and J. R. Musser and M. Nozar and K. Olchanski and A. Olin and R. Openshaw and J. -M. Poutissou and R. Poutissou and M. Quraan and V. Selivanov and G. Sheffer and B. Shin and T. Stanislaus and R. Tacik and R. Tribble},
  journal={Physical Review D},
  • Twist Collaboration R.P. MacDonald, R. Bayes, +33 authors R. Tribble
  • Published 2008
  • Physics
  • Physical Review D
  • The TWIST Collaboration has performed new measurements of two of the parameters that describe muon decay: p, which governs the shape of the overall momentum spectrum, and δ, which governs the momentum dependence of the parity-violating decay asymmetry. This analysis gives the results p = 0.75014 ± 0.000 17(stat) ±0.00044 (syst) ± 0.00011(η), where the last uncertainty arises from the correlation between p and the decay parameter η, and δ = 0.75067 ± 0.00030(stat) ± 0.00067(syst). These are… CONTINUE READING
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