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26 April 2024

» pubmed » pmid15783475

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Measurement of the Michel parameter rho in muon decay
J R Musser ; R Bayes ; Yu I Davydov ; P Depommier ; J Doornbos ; W Faszer ; C A Gagliardi ; A Gaponenko ; D R Gill ; P Green ; P Gumplinger ; M D Hasinoff ; R S Henderson ; J Hu ; B Jamieson ; P Kitching ; D D Koetke ; A A Krushinsky ; Yu Yu Lachin ; J A Macdonald ; R P MacDonald ; G M Marshall ; E L Mathie ; L V Miasoedov ; R E Mischke ; P M Nord ; K Olchanski ; A Olin ; R Openshaw ; T A Porcelli ; J-M Poutissou ; R Poutissou ; M A Quraan ; N L Rodning ; V Selivanov ; G Sheffer ; B Shin ; F Sobratee ; T D S Stanislaus ; R Tacik ; V D Torokhov ; R E Tribble ; M A Vasiliev ; D H Wright ; ;
Date:	18 Mar 2005
Journal:	Phys Rev Lett, 94 (10), 101805
Abstract:	The TWIST Collaboration has measured the Michel parameter rho in normal muon decay, mu(+)--> e(+)nu(e)nu (mu). In the standard model, rho = 3/4. Deviations from this value imply mixing of left- and right-handed muon and electron couplings. We find rho=0.750 80+/-0.000 32(stat) +/- 0.000 97(syst) +/- 0.000 23, where the last uncertainty represents the dependence of rho on the Michel parameter eta. This result sets new limits on the W(L)-W(R) mixing angle in left-right symmetric models.
Source:	PubMed, pmid15783475
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