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New Experimental Constraints for the Standard Model from Muon Decay
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New Experimental Constraints for the Standard Model from Muon Decay
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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 {\rho}, {\delta}, and (P_{\mu}){\xi} 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 |(g_R/g_L){\zeta}|<0.020 and (g_L/g_R)m_2> 578 GeV/c^2, both 90% C.L.
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