منابع مشابه
– 1 – Muon Decay Parameters
Introduction: All measurements in direct muon decay, μ − → e − + 2 neutrals, and its inverse, ν μ + e − → μ − + neutral, are successfully described by the " V-A interaction, " which is a particular case of a local, derivative-free, lepton-number-conserving, four-fermion interaction [1]. As shown below, within this framework, the Standard Model assumptions, such as the V-A form and the nature of...
متن کاملUnparticles and Muon Decay
Recently Georgi has discussed the possible existence of ‘Unparticles’ describable by operators having non-integral scaling dimensions. With the interaction of these with the Standard Model (SM) particles being constrained only by gauge and Lorentz symmetries, it affords a new source for lepton flavour violation. Current and future muon decay experiments are shown to be very sensitive to such sc...
متن کاملMuon Decay Parameters (TWIST experiment at TRIUMF)
The TRIUMF Weak Interaction Symmetry Test (TWIST) experiment has measured the spectrum of positrons from muon decay and determined the decay parameters: ρ = 0.75014 ± 0.00017(stat.) ± 0.00044(syst.) ± 0.00011(η), δ = 0.75067 ± 0.00030(stat.) ± 0.00067(syst.), P π µ ξ = 1.0003 ± 0.0006(stat.) ± 0.0038(syst.). The results are in good agreement with the Standard Model. Future prospects for this me...
متن کاملRadiative Corrections to Muon and Neutron Decay
The corrections to muon decay due to electromagnetic interactions have been recalculated. Our results differ from those of Behrends, Finkelstein, and Sirlin, because those authors used an inconsistent method for handling the infrared divergences which arise separately in the real and virtual processes. The disagreement is especially significant near the end of the electron (positron) spectrum w...
متن کاملWrong-Helicity Electrons in Radiative Muon Decay
We have studied in detail the spectrum of the decay μ− → e−ν̄eνμγ as a function of the electron helicity, and verify the prediction [1] that a significant fraction of the electrons in this decay is righthanded. These “wrong-helicity” electrons persist in the limit λ = me/mμ → 0, and are connected with helicity-flip bremsstrahlung in QED. The longitudinal polarization of the electron is calculate...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2019
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/1350/1/012062