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Henderson, R. Tacik, T.D.S. Stanislaus, TWIST Collaboration: R.P. MacDonald, V. Selivanov, W. Faszer, Yu.I. Davydov","submitted_at":"2008-07-07T20:52:00Z","abstract_excerpt":"The TWIST collaboration has performed new measurements of two of the parameters that describe muon decay: $\\rho$, which governs the shape of the overall momentum spectrum, and $\\delta$, which governs the momentum dependence of the parity-violating decay asymmetry. This analysis gives the results $\\rho=0.75014\\pm 0.00017(\\text{stat})\\pm 0.00044(\\text{syst})\\pm 0.00011(\\eta)$, where the last uncertainty arises from the correlation between $\\rho$ and the decay parameter $\\eta$, and $\\delta = 0.75067\\pm 0.00030(\\text{stat})\\pm 0.00067(\\text{syst})$. 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Gaponenko, A. Grossheim, A. Hillairet, A. Olin, B. Jamieson, B. Shin, C.A. Gagliardi, D.D. Koetke, D.R. Gill, E.L. Mathie, G.M. Marshall, G. Sheffer, J. Bueno, J. Hu, J.-M. Poutissou, J.R. Musser, K. Olchanski, M.A. Quraan, M.C. Fujiwara, M.D. Hasinoff, M. Nozar, P. Depommier, P. Gumplinger, P. Kitching, R. Bayes, R.E. Mischke, R.E. Tribble, R. Openshaw, R. Poutissou, R.S. Henderson, R. Tacik, T.D.S. Stanislaus, TWIST Collaboration: R.P. MacDonald, V. Selivanov, W. Faszer, Yu.I. Davydov","submitted_at":"2008-07-07T20:52:00Z","abstract_excerpt":"The TWIST collaboration has performed new measurements of two of the parameters that describe muon decay: $\\rho$, which governs the shape of the overall momentum spectrum, and $\\delta$, which governs the momentum dependence of the parity-violating decay asymmetry. 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