New Experimental Constraints for the Standard Model from Muon Decay
High Energy Physics - Experiment
2015-03-17 v2
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 {\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.
Cite
@article{arxiv.1010.4998,
title = {New Experimental Constraints for the Standard Model from Muon Decay},
author = {R. Bayes and J. F. Bueno and A. Hillairet and Yu. I. Davydov and P. Depommier and W. Faszer and C. A. Gagliardi and A. Gaponenko and D. R. Gill and A. Grossheim and P. Gumplinger and M. D. Hasinoff and R. S. Henderson and J. Hu and D. D. Koetke and R. P. MacDonald and G. M. Marshall and E. L. Mathie and R. E. Mischke and K. Olchanski and A. Olin and R. Openshaw and J. -M. Poutissou and R. Poutissou and V. Selivanov and G. Sheffer and B. Shin and T. D. S. Stanislaus and R. Tacik and R. E. Tribble},
journal= {arXiv preprint arXiv:1010.4998},
year = {2015}
}