Michel Parameters

Within the Standard Model of electroweak interactions, these parameters are expected to be:

ho={3\over4} \quad \eta=0 \quad \xi=1 \quad \xi\delta={3\over4}

Precise measurements of the energy and angular distributions of the product lepton in decays of polarized muons and taus are so far in good agreement with these predictions of the Standard Model.

REFERENCES

Lecture on Lepton Universality by Michel Davier at the 1997 SLAC Summer Institute.

Electroweak Couplings, Lepton Universality, and the Origin of Mass: An Experimental Perspective , article by John Swain, from the Proceedings of the Third Latin American Symposium on High Energy Physics.

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Michel Parameters

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