New Experimental Constraints for the Standard Model from Muon Decay

R. Bayes , J.F. Bueno , A. Hillairet , Yu.I. Davydov , P. Depommier , W. Faszer , C.A. Gagliardi , A. Gaponenko

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D.R. Gill A. Grossheim P. Gumplinger M.D. Hasinoff R.S. Henderson 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

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classification ✦ hep-ex

keywords decaymodelmeasurementmuonstandardcollaborationcompletedconstraints

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The TWIST Collaboration has completed a new measurement of the energy-angle spectrum of positrons from the decay of highly polarized muons. A simultaneous measurement of the muon decay parameters {\rho}, {\delta}, and (P_{\mu}){\xi} tests the Standard Model (SM) in a purely leptonic process and provides improved limits for relevant extensions to the SM. Specifically, for the generalized left-right symmetric model |(g_R/g_L){\zeta}|<0.020 and (g_L/g_R)m_2> 578 GeV/c^2, both 90% C.L.

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New Experimental Constraints for the Standard Model from Muon Decay

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