Measurement of the Muon Decay Parameter delta

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.

Extended to 5 pages. Referee's comments answered

References in corpus (8)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Muon Decay and Physics Beyond the Standard Model
• O(α^2 \ln(m_μ/m_e)) Corrections to Electron Energy Spectrum in Muon Decay
• Measurement of the Michel Parameter $\rho$ in Muon Decay
• Muon Decay Spectrum: Leading Logarithmic Approximation
• Higher order QED corrections to muon decay spectrum
• First Order Radiative Corrections to Polarized Muon Decay Spectrum
• Virtual and Soft Pair Corrections to Polarized Muon Decay Spectrum

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