Measurement of the Michel Parameter $ρ$ in Muon Decay
| dc.creator | TWIST Collaboration | |
| dc.creator | Musser, J. R. | |
| dc.date | 2004-09-29 | |
| dc.date.accessioned | 2026-07-07T10:28:28Z | |
| dc.date.available | 2026-07-07T10:28:28Z | |
| dc.description | The TWIST Collaboration has measured the Michel parameter $ρ$ in normal muon decay, $μ^+ \to e^+ ν_e \barν_μ$. In the Standard Model, $ρ$ = 3/4. Deviations from this value require mixing of left- and right-handed muon and electron couplings in the muon-decay Lagrangian. We find $ρ$ = 0.75080 $\pm$ 0.00044(stat.) $\pm$ 0.00093(syst.) $\pm$ 0.00023, where the last uncertainty represents the dependence of $ρ$ on the Michel parameter $η$. This result sets new limits on the $W_L-W_R$ mixing angle in left-right symmetric models. | |
| dc.description | 4 pages, 3 figures, submitted to PRL | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0409063 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0409063 | |
| dc.identifier | Phys.Rev.Lett.94:101805,2005 | |
| dc.identifier | doi:10.1103/PhysRevLett.94.101805 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177460 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the Michel Parameter $ρ$ in Muon Decay | |
| dc.type | text |