The Michel parameters, usually denoted by and, are four parameters used in describing the phase space distribution of leptonic decays of charged leptons, . They are named after the physicist Louis Michel. Sometimes instead of, the product is quoted. Within the Standard Model of electroweak interactions, these parameters are expected to be
Precise measurements of energy and angular distributions of the daughter leptons in decays of polarized muons and tau leptons are so far in good agreement with these predictions of the Standard Model.
Read more about Michel Parameters: Muon Decay
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“What our children have to fear is not the cars on the highways of tomorrow but our own pleasure in calculating the most elegant parameters of their deaths.”
—J.G. (James Graham)