The quantity Pμπξ, where ξ is one of the muon decay parameters and Pμπ is the degree of muon polarization in pion decay, has been measured. The value Pμπξ=1.0003±0.0006(stat.)±0.0038(syst.) was obtained. This result agrees with previous measurements but is over a factor of 2 more precise. It also agrees with the Standard Model prediction for Pμπξ and thus leads to restrictions on left-right symmetric models.
Physical Review D
- Pub Date:
- October 2006
- Decays of muons;
- Extensions of electroweak gauge sector;
- High Energy Physics - Experiment
- 11 pages, 7 figures, Phys. Rev. D 74, 072007 (2006) Final version