Predictions for energy distribution and polarization of the positron from the polarized muon decay

Details Predictions for energy distribution and polarization of the positron from the polarized muon decay Predictions for energy distribution and polarization of the positron from the polarized muon decay

2004-05-09

arxiv.org/abs/hep-ph/0405073v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, no figures

Scientific paper

The pure lepton decay of the polarized muon is considered, accounting for a new tensor interaction which is outside of the Michel local interactions. This interaction leads to new energy distribution and polarization of the final charged lepton. The presence of such a type of interaction is strongly required for the description of the latest experimental results on the weak radiative pion decay in the full kinematic region. Assuming quark--lepton universality, predictions for a deviation from the Standard Model are made using only one new parameter. They do not contradict the present experimental data and can be verified further in the on-going experiments at PSI and TRIUMF, at least to the level of 3 standard deviations.

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