Global analysis of muon decay measurements

Abstract

We have performed a global analysis of muon decay measurements to establish model-independent limits on the space-time structure of the muon decay matrix element. We find limits on the scalar, vector and tensor coupling of right- and left-handed muons to right- and left-handed electrons. The limits on those terms that involve the decay of right-handed muons to left-handed electrons are more restrictive than in previous global analyses, while the limits on the other non-standard model interactions are comparable. The value of the Michel parameter eta found in the global analysis is -0.0036 \pm 0.0069, slightly more precise than the value found in a more restrictive analysis of a recent measurement. This has implications for the Fermi coupling constant G_F.

arXiv comment5 pages, 3 tables

References in corpus (5)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Muon Decay and Physics Beyond the Standard Model
• Measurement of the Michel Parameter $\rho$ in Muon Decay
• Measurement of the Muon Decay Parameter delta
• Neutrino mass constraints on $\mu$-decay and ${\pi }^0\to \nu \bar{\nu }$

Cited by in corpus (20)

• Low Energy Precision Test of Supersymmetry
• Unanswered Questions in the Electroweak Theory
• Left-right mixing on leptonic and semileptonic $b\to u$ decays
• Supersymmetric Contributions to Weak Decay Correlation Coefficients
• Precise measurement of parity violation in polarized muon decay
• Precision muon decay measurements and improved constraints on the weak interaction
• Terascale Physics Opportunities at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
• A Precision Measurement of the Muon Decay Parameters $\rho$ and $\delta$
• Measurement of P_{mu}xi in Polarized Muon Decay
• Question of Lorentz invariance in muon decay
• Michel parameters in the presence of massive Dirac and Majorana neutrinos
• Fermionic Effective Operators and Higgs Production at a Linear Collider
• Evidence for right-handed neutrinos at a neutrino factory
• A new method for measurement of the Michel parameters that describe the daughter muon polarization in the ${\tau }^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }{\nu }_{\tau }$ decay
• Neutrino Mass Implications for Muon Decay Parameters
• Renaissance of the ~1 TeV Fixed-Target Program
• Muon-Decay Parameters from COHERENT
• Tensor interaction in coherent elastic neutrino-nucleus scattering
• Charged current reactions in the NuSOnG and a test of neutrino-W couplings
• TWIST: Precision Measurement of the Muon Decay Parameters