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Article overview
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Measurement of the Michel Parameter $
ho$ in Muon Decay | TWIST Collaboration: J.R. Musser
; et al
; | Date: |
30 Sep 2004 | Journal: | Phys.Rev.Lett. 94 (2005) 101805 | Subject: | hep-ex | Abstract: | The TWIST Collaboration has measured the Michel parameter $
ho$ in normal muon decay, $mu^+ o e^+
u_e ar{
u}_{mu}$. In the Standard Model, $
ho$ = 3/4. Deviations from this value require mixing of left- and right-handed muon and electron couplings in the muon-decay Lagrangian. We find $
ho$ = 0.75080 $pm$ 0.00044(stat.) $pm$ 0.00093(syst.) $pm$ 0.00023, where the last uncertainty represents the dependence of $
ho$ on the Michel parameter $eta$. This result sets new limits on the $W_L-W_R$ mixing angle in left-right symmetric models. | Source: | arXiv, hep-ex/0409063 | Services: | Forum | Review | PDF | Favorites |
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