Constraints on Muon Decay Parameters from Neutrino Mass

Details Constraints on Muon Decay Parameters from Neutrino Mass Constraints on Muon Decay Parameters from Neutrino Mass

2006-08-15

arxiv.org/abs/hep-ph/0608163v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, contribution to the proceedings of CIPANP 2006 (May 30-June 3, 2006), Rio Grande, Puerto Rico

Scientific paper

10.1063/1.2220417

We derive model-independent constraints on chirality-changing terms in the muon decay Lagrangian using limits on neutrino mass. We consider all dimension-six operators invariant under the gauge symmetry of the Standard Model which contribute to either a Dirac neutrino mass or muon decay. Taking an upper limit on neutrino mass of 1 eV, we derive limits on the contributions of chirality-changing operators to the Michel parameters four orders of magnitude tighter than the current experimental constraints. We also identify two operators which, due to their flavor structure, are not constrained by neutrino mass. If near-future experiments find contributions to muon decay from these operators, it could indicate interesting flavor structure in physics beyond the SM.

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