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pubmed:abstractText |
The TWIST Collaboration has completed a new measurement of the energy-angle spectrum of positrons from the decay of highly polarized muons. A simultaneous measurement of the muon decay parameters ?, ?, and P(?)(?)? tests the standard model in a purely leptonic process and provides improved limits for relevant extensions to the standard model. Specifically, for the generalized left-right symmetric model |(g(R)/g(L))?|<0.020 and (g(L)/g(R))m(2)>578??GeV/c(2), both 90% C.L.
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