Measurement of the Michel parameter rho in muon decay
The TWIST Collaboration has measured the Michel parameter rho in normal muon decay,u+ -> e+VeVu. In the standard model of particle physics,rho = 3/4. Deviations from this value require mixing of left- and right-handed muon and electron couplings in the muon-decay Lagrangian. We find rho = 0:75080...
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| Format: | Others |
| Language: | en_US |
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Texas A&M University
2006
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| Online Access: | http://hdl.handle.net/1969.1/3297 |
| Summary: | The TWIST Collaboration has measured the Michel parameter rho in normal muon
decay,u+ -> e+VeVu. In the standard model of particle physics,rho = 3/4. Deviations
from this value require mixing of left- and right-handed muon and electron couplings in
the muon-decay Lagrangian. We find rho = 0:75080+-0:00032(stat.)+-0:00097(syst.) +- 0:00023, where the last uncertainty represents the dependence of rho on the Michel
parameter n. This result sets new limits on the WL - WR mixing angle in left-right
symmetric models. |
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