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Complementarity in lepton-flavour violating muon decay experiments

Abstract : This note presents an analysis of lepton-flavour-violating muon decays within the framework of a low-energy effective field theory that contains higher-dimensional operators allowed by QED and QCD symmetries. The decay modes $\mu\to e \gamma$ and $\mu\to 3e$ are investigated below the electroweak symmetry-breaking scale, down to energies at which such processes occur, i.e. the muon mass scale. The complete class of dimension-5 and dimension-6 operators is studied systematically at the tree level, and one-loop contributions to the renormalisation group equations are fully taken into account. Current experimental limits are used to extract bounds on the Wilson coefficients of some of the operators and, ultimately, on the effective couplings at any energy level below the electroweak symmetry-breaking scale. Correlations between two couplings relevant to both processes illustrate the complementarity of searches planned for the MEG II and Mu3e experiments.
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Contributor : Dominique Girod <>
Submitted on : Thursday, November 17, 2016 - 11:52:20 AM
Last modification on : Tuesday, November 19, 2019 - 2:42:06 AM

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  • HAL Id : in2p3-01398463, version 1
  • ARXIV : 1611.03409



A. Crivellin, S. Davidson, G.M. Pruna, A. Signer. Complementarity in lepton-flavour violating muon decay experiments. 18th International Workshop on Neutrino Factories and Future Neutrino Facilities Search (NuFact16), Aug 2016, Quy Nhon, Vietnam. ⟨in2p3-01398463⟩



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