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20 April 2024

» arxiv » 1010.4998

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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 ; D.R. Gill ; A. Grossheim ; P. Gumplinger ; M.D. Hasinoff ; R.S. Henderson ; J. Hu ; D.D. Koetke ; R.P. MacDonald ; G. 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:	24 Oct 2010
Abstract:	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 { ho}, {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, these results set significant new limits on the heavy $W$ mass and the mixing angle in a class of left-right symmetric models.
Source:	arXiv, 1010.4998
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