Low energy effects of neutrino masses

Abstract

While all models of Majorana neutrino masses lead to the same dimension five effective operator, which does not conserve lepton number, the dimension six operators induced at low energies conserve lepton number and differ depending on the high energy model of new physics. We derive the low-energy dimension six operators which are characteristic of generic Seesaw models, in which neutrino masses result from the exchange of heavy fields which may be either fermionic singlets, fermionic triplets or scalar triplets. The resulting operators may lead to effects observable in the near future, if the coefficients of the dimension five and six operators are decoupled along a certain pattern, which turns out to be common to all models. The phenomenological consequences are explored as well, including their contributions to $\mu \to e\gamma$ and new bounds on the Yukawa couplings for each model.

modifications: couplings in appendix B, formulas (121)-(122) on rare leptons decays (to match with published version) and consequently bounds in table 8

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• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• CP-violation from non-unitary leptonic mixing
• Probing seesaw at LHC
• Renormalizable Adjoint SU(5)
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• Large gauge invariant non-standard neutrino interactions
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• Probing non-unitary mixing and CP-violation at a Neutrino Factory
• Testing non-unitarity of neutrino mixing matrices at neutrino factories
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• Correlative signatures of heavy Majorana neutrinos and doubly-charged Higgs bosons at the Large Hadron Collider
• Multiple seesaw mechanisms of neutrino masses at the TeV scale
• Loop bounds on non-standard neutrino interactions
• Non-Standard Neutrino Interactions from a Triplet Seesaw Model
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• NMSSM and Seesaw Physics at LHC
• Lepton Masses in a Minimal Model with Triplet Higgs Bosons and $S_3$ Flavor Symmetry
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• The lepton-flavour violating decay τ\to μμ\antimu at the LHC
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• Friedberg-Lee symmetry and tri-bimaximal neutrino mixing in the inverse seesaw mechanism
• Looking for signals beyond the neutrino Standard Model
• TeV-scale Type-II Seesaw Models and Possible Collider Signatures
• CP asymmetries from non-unitarity leptonic mixing