Electromagnetic suppression of the decay mu --> e+gamma

Abstract

Due to large QED anomalous dimensions of the electric and magnetic dipole operators, the rate of the rare muon decay mu --> e+gamma is suppressed by the factor [ 1- 8 alpha/pi ln(Lambda/m_mu) ], independent of the physics responsible for the lepton-flavor violation, except for the scale Lambda at which it occurs. For Lambda = 100 -- 1000 GeV, the resulting decrease of the rate amounts to about 12 -- 17 %.

Added analysis of four-fermion operators. Journal version

References in corpus (3)

• Muon Decay and Physics Beyond the Standard Model
• New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma
• Charged-Lepton-Flavour Violation in the Light of the Super-Kamiokande Data

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• Lepton Flavour Violating tau Decays in the Left-Right Symmetric Model
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• Constraints on the rare tau decays from mu --> e gamma in the supersymmetric see-saw model
• Lepton Flavor Violation in Predictive Supersymmetric GUT Models
• Lepton Flavor Violation in SUSY GUT Model with Non-universal Sfermion Masses
• Charged lepton flavor violation in light of Muon $g-2$
• Theoretical constraints on the rare tau decays in the MSSM
• SuperLFV: An SLHA tool for lepton flavor violating observables in supersymmetric models