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The dominant muon decay mode (sometimes called the Michel decay after Louis Michel) is the simplest possible: the muon decays to an electron, an electron antineutrino, and a muon neutrino. Antimuons, in mirror fashion, most often decay to the corresponding antiparticles: a positron , an electron neutrino, and a muon antineutrino.
Consider the decay of the positive muon: μ + → e + + ν e + ν ¯ μ . {\displaystyle \mu ^{+}\to e^{+}+\nu _{e}+{\bar {\nu }}_{\mu }.} In the muon rest frame , energy and angular distributions of the positrons emitted in the decay of a polarised muon expressed in terms of Michel parameters are the following, neglecting electron and neutrino ...
The Mu to E Gamma (MEG) is a particle physics experiment dedicated to measuring the decay of the muon into an electron and a photon, a decay mode which is heavily suppressed in the Standard Model by lepton flavour conservation, but enhanced in supersymmetry and grand unified theories. [1]
In particle physics, a lepton is an elementary particle of half-integer spin (spin 1 / 2 ) that does not undergo strong interactions. [1] Two main classes of leptons exist: charged leptons (also known as the electron-like leptons or muons), including the electron, muon, and tauon, and neutral leptons, better known as neutrinos.
Fermi's Theory was the first theoretical effort in describing nuclear decay rates for β decay. The interaction could also explain muon decay via a coupling of a muon, electron-antineutrino, muon-neutrino and electron, with the same fundamental strength of the interaction.
Therefore, suppression of the electron decay channel comes from the fact that the electron's mass is much smaller than the muon's. The electron is relatively massless compared with the muon, and thus the electronic mode is greatly suppressed relative to the muonic one, virtually prohibited.
The muon spin motion may be measured over a time scale dictated by the muon decay, i.e. a few times τ μ, roughly 10 μs. The asymmetry in the muon decay correlates the positron emission and the muon spin directions. The simplest example is when the spin direction of all muons remains constant in time after implantation (no motion).
In this experiment, beams of muon neutrinos (ν μ) and muon antineutrinos (ν μ) were alternately produced by an accelerator. By the time they got to the detector, a significantly higher proportion of electron neutrinos (ν e) was observed from the ν μ beams, than electron antineutrinos (ν e) were from the ν μ beams. Analysis of these ...