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Leptogenesis with Dirac Neutrinos

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arxiv hep-ph/9907562 v3 pith:PY6LU6VA submitted 1999-07-30 hep-ph

classification hep-ph
keywords asymmetrybaryondiracmassesmechanismneutrinoneutrinosuniverse
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We describe a "neutrinogenesis" mechanism whereby, in the presence of right-handed neutrinos with sufficiently small pure Dirac masses, (B+L)-violating sphaleron processes create the baryon asymmetry of the Universe, even when B=L=0 initially. It is shown that the resulting neutrino mass constraints are easily fulfilled by the neutrino masses suggested by current experiments. We present a simple toy model which uses this mechanism to produce the observed baryon asymmetry of the Universe. (PostScript Errors corrected in latest Version).

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Forward citations

Cited by 13 Pith papers

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

  1. Universal Seesaw Leptogenesis

    hep-ph 2025-12 conditional novelty 7.0 of 10

    Leptogenesis can proceed from single-generation gauge-singlet mediator decays in a Universal Seesaw model if parity is broken in the neutrino sector; the lightest right-handed neutrino is a sub-eV dark-radiation relic.

  2. Primordial Dirac Leptogenesis

    hep-ph 2025-11 conditional novelty 7.0 of 10

    Baryogenesis can proceed via CP-violating inflaton decays that imprint an asymmetry in an inert Higgs doublet, which decays into Dirac neutrinos and is converted by sphalerons to the observed baryon asymmetry.

  3. DW-genesis: baryon number from domain wall network collapse

    hep-ph 2024-11 conditional novelty 7.0 of 10

    Collapsing axionic domain walls can produce the baryon asymmetry via spontaneous baryogenesis, with a maximum yield set by the annihilation temperature, but minimal post-inflationary realisations suffer a suppression ...

  4. Thermal Leptogenesis in the BNT Model of Neutrino Mass

    hep-ph 2026-08 conditional novelty 6.0 of 10

    In the BNT neutrino-mass model, thermal leptogenesis can explain the observed baryon asymmetry with triplet masses above roughly 3.5e7 GeV in the hierarchical case and as low as 1.7 TeV with resonant enhancement.

  5. Conversion-Driven Baryogenesis in Flavored Dark Matter Models

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Quark-philic flavored dark matter realizes conversion-driven baryogenesis via CP-violating mediator conversions, yielding viable DM masses up to ~1.2 TeV and long-lived-particle LHC signatures.

  6. The mass-coupling effect in leptogenesis

    hep-ph 2025-09 conditional novelty 6.0 of 10

    In weak-washout heavy-particle decay leptogenesis, the lepton asymmetry is approximately independent of the decaying particle mass and the couplings of thermalized decay products, because the nonthermal distribution s...

  7. Improved cosmological limits on $Z^\prime$ models with light right-handed neutrinos

    hep-ph 2025-05 conditional novelty 6.0 of 10

    The ACT DR6 bound on extra radiation yields the strongest exclusion limits yet on U(1)_{B-L} Z' bosons coupled to light right-handed neutrinos, beating colliders across most of the mass range.

  8. Forbidden neutrinogenesis

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A neutrinophilic two-Higgs-doublet model with Dirac neutrinos can generate the observed baryon asymmetry through finite-temperature 'forbidden' leptogenesis, favoring normal neutrino mass ordering and 0 < δ_CP < π.

  9. Higgs Troika for Baryon Asymmetry

    hep-ph 2019-09 conditional novelty 6.0 of 10

    A 'Higgs Troika' with two TeV-scale additional Higgs doublets and right-handed neutrinos can generate the observed baryon asymmetry while surviving current flavor and collider constraints.

  10. Throwing away antimatter via neutrino oscillations during the reheating era

    hep-ph 2019-08 conditional novelty 6.0 of 10

    CP-violating flavor oscillations of leptons produced by inflaton decay can store asymmetry in a right-handed neutrino; later lepton-number-violating decay leaves the baryon asymmetry, working for reheating temperature...

  11. Electromagnetic Dirac Cogenesis

    hep-ph 2025-07 conditional novelty 5.0 of 10

    A single out-of-equilibrium decay chain of heavy vector-like fermions via electromagnetic dipole operators can simultaneously generate the baryon asymmetry and an asymmetric dark matter relic with mass around 1.9 prot...

  12. Minimal Dirac seesaw dark matter

    hep-ph 2024-12 conditional novelty 5.0 of 10

    A Z4-symmetric Dirac seesaw makes the imaginary part of a seesaw scalar a stable dark matter candidate and links its phenomenology to gravitational wave and CMB observables.

  13. Observing Dirac neutrinos in the cosmic microwave background

    hep-ph 2019-08 accept novelty 4.0 of 10

    Future CMB Stage IV measurements of N_eff will detect or exclude thermally populated right-handed neutrino partners in most Dirac-neutrino models, constraining new gauge bosons and scalar mediators more strongly than ...

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