Measurement Of The Michel Parameter Rho In Muon Decay

Jr Musser,R Bayes, Yi Davydov, P Depommier,J Doornbos,W Faszer,Ca Gagliardi, A Gaponenko,Dr Gill,P Green, P Gumplinger,Md Hasinoff, Rs Henderson,J Hu, B Jamieson,P Kitching,Dd Koetke, Aa Krushinsky, Yy Lachin,Ja Macdonald, Rp Macdonald,Gm Marshall,El Mathie, Lv Miasoedov,Re Mischke,Pm Nord,K Olchanski,A Olin,R Openshaw, Ta Porcelli,Jm Poutissou,R Poutissou, Ma Quraan,Nl Rodning,V Selivanov, G Sheffer,B Shin, F Sobratee,Tds Stanislaus,R Tacik, Vd Torokhov, Re Tribble, Ma Vasiliev, Dh Wright

Physical review letters（2005）

引用 45|浏览29

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摘要

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.

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