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Paper detail

New Experimental Constraints for the Standard Model from Muon Decay

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 ρ, δ, and (P_μ)ξ 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)ζ|<0.020 and (g_L/g_R)m_2> 578 GeV/c^2, both 90% C.L.

preprint2010arXivOpen access
R. BayesJ. F. BuenoA. HillairetYu. I. DavydovP. DepommierW. FaszerC. A. GagliardiA. GaponenkoD. R. GillA. GrossheimP. GumplingerM. D. HasinoffR. S. HendersonJ. HuD. D. KoetkeR. P. MacDonaldG. M. MarshallE. L. MathieR. E. MischkeK. OlchanskiA. OlinR. OpenshawJ. -M. PoutissouR. PoutissouV. SelivanovG. ShefferB. ShinT. D. S. StanislausR. TacikR. E. Tribble
hep-ex
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R. BayesJ. F. BuenoA. HillairetYu. I. DavydovP. DepommierW. FaszerC. A. GagliardiA. GaponenkoD. R. GillA. GrossheimP. GumplingerM. D. HasinoffR. S. HendersonJ. HuD. D. KoetkeR. P. MacDonaldG. M. MarshallE. L. MathieR. E. MischkeK. OlchanskiA. OlinR. OpenshawJ. -M. PoutissouR. PoutissouV. SelivanovG. ShefferB. ShinT. D. S. StanislausR. TacikR. E. Tribble

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