Measurement of the Muon Decay Parameter delta
TWIST Collaboration: A. Gaponenko, R. Bayes, Yu.I. Davydov, P., Depommier, J. Doornbos, W. Faszer, M.C. Fujiwara, C.A. Gagliardi, D.R. Gill,, P. Green, P. Gumplinger, M.D. Hasinoff, R.S. Henderson, J. Hu, B. Jamieson,, P. Kitching, D.D. Koetke, A.A. Krushinsky, Yu.Yu. Lachin
TL;DR
This paper reports a precise measurement of the muon decay parameter delta, confirming its consistency with the Standard Model and constraining new physics models involving muon polarization and decay parameters.
Contribution
The TWIST collaboration provides a highly precise measurement of delta, improving constraints on muon decay parameters and implications for physics beyond the Standard Model.
Findings
delta = 0.74964 ± 0.00066(stat.) ± 0.00112(syst.)
Product Pmu xi constrained within 0.9960 to 1.0040
Results support Standard Model predictions and limit new physics
Abstract
The muon decay parameter delta has been measured by the TWIST collaboration. We find delta = 0.74964 +- 0.00066(stat.) +- 0.00112(syst.), consistent with the Standard Model value of 3/4. This result implies that the product Pmuxi of the muon polarization in pion decay, Pmu, and the muon decay parameter xi falls within the 90% confidence interval 0.9960 < Pmuxi < xi < 1.0040. It also has implications for left-right-symmetric and other extensions of the Standard Model.
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