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The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis

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arxiv hep-ph/0210271 v2 pith:55NX4NET submitted 2002-10-21 hep-ph

classification hep-ph
keywords effectivelagrangianlow-energyneutrinooperatorseesawdimension-6high-energy
verification ladder T0 review T1 audit T2 compute T3 formal

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The effective Lagrangian for the seesaw model is derived including effects due to CP violation. Besides the usual dimension-5 operator responsible for light neutrino masses, a dimension-6 operator is obtained. For three or less heavy neutrino generations, the inclusion of both operators is necessary and sufficient for all independent physical parameters of the high-energy seesaw Lagrangian to appear in the low-energy effective theory, including the CP-odd phases relevant for leptogenesis. The dimension-6 operator implies exotic low-energy couplings for light neutrinos, providing a link between the high-energy physics and low-energy observables.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Majoron at two loops

    hep-ph 2019-09 conditional novelty 8.0 of 10

    The complete leading-order two-loop Majoron couplings to all Standard Model gauge bosons and to flavor-changing quarks are derived, and they change the expected photon coupling and rare-decay rates compared with earli...

  2. How to Identify a Majoron: Effective Field Theories of Spontaneous Lepton Number Breaking

    hep-ph 2026-08 conditional novelty 7.0 of 10

    Seesaw Majoron models imply parameter-free correlations among Higgs, muon decay, and neutrino observables that can identify the neutrino mass mechanism.

  3. Neutrino t-channels at Colliders: When Light Neutrinos Matter

    hep-ph 2026-07 conditional novelty 6.0 of 10

    The same-sign WW→ℓℓ t-channel signal for heavy Majorana neutrinos is cancelled by light-neutrino contributions in the seesaw model; the opposite-sign eµjj channel is a better probe.

  4. Taming flavour violation in the Inverse Seesaw

    hep-ph 2024-12 conditional novelty 6.0 of 10

    New eta-based parametrisations of the ISS(3,3) show that Z-penguin flavour violation can reveal non-degenerate heavy sterile mixing even when radiative decays are absent.

  5. Family-separated seesaw relations of Majorana neutrinos

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    A family-separated solution to the exact seesaw equation yields per-family relations between light and heavy Majorana neutrino parameters.

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