New Experimental Constraints for the Standard Model from Muon Decay
Abstract
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 , δ, and (Pμ) tests the Standard Model (SM) in a purely leptonic process and provides improved limits for relevant extensions to the SM. Specifically, for the generalized left-right symmetric model |(gR/gL)ζ|<0.020 and (gL/gR)m2> 578 GeV/c2, both 90% C.L.
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