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NEUTRINO MASSES, LEPTOGENESIS, DARK MATTER, etc.

NEUTRINO MASSES, LEPTOGENESIS, DARK MATTER, etc. Dmitry Zhuridov ( NTHU, Hsinchu) The Chung-Yuan Christian University HEP Seminar Chungli, November 10, 2009. In collaboration with: Chao-Qiang Geng (NTHU) Chuan-Hung Chen (NCKU & NCTS). Outline. Brief introduction and motivation.

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NEUTRINO MASSES, LEPTOGENESIS, DARK MATTER, etc.

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  1. NEUTRINO MASSES, LEPTOGENESIS, DARK MATTER, etc. • Dmitry Zhuridov • (NTHU, Hsinchu) • The Chung-Yuan Christian University HEP Seminar • Chungli, November 10, 2009 In collaboration with: Chao-Qiang Geng (NTHU) Chuan-Hung Chen (NCKU & NCTS)

  2. Outline Brief introduction and motivation Non-degenerate Low Energy LG Neutrino Masses, LG and Decaying DM • Model definition • LG realization. Neutrino masses generation • DM and Li problems solvation • Possible Colliders signatures and EW precision tests • Model (LG, nu masses & DM) • Results Conclusion

  3. Brief introduction and motivation

  4. Properties of the universe

  5. Evidence of incompleteness of the SM • (particles) Neutrino Masses • (astro-ph) DM? • (particles) Quadratically divergent Higgs mass at the one-loop level • (astro-ph) Baryon asymmetry. Li problems? Experiment: Theory:

  6. Possible solutions + NR : } MR > 10^9 GeV (Davidson-Ibarra bound) + SUSY : Gravitino problem arise! How to produce NR? We are searching for alternative solutions with no NR and no SUSY.

  7. Non-degenerate Low Energy LG Positive reply from Phys.Rev.D

  8. Basic ideas come from • Ernest Ma (2006): Verifible Radiative Seesaw Mechanizm of Neutrino masses and DM(Z2 odd HMNs and new scalardoublet ) • Pei-Hong Gu and Utpal Sarkar (2008): Pathways to tastable LG(Degeneracy of N and masses is needed to satisfy the out-of-equilibrium condition) η η

  9. Model definition

  10. Leptogenesis realization

  11. Neutrino Masses generation 2

  12. Modified Davidson-Ibarra bound

  13. Dark Matter generation

  14. Li problems solvation

  15. Possible Collider Signatures

  16. Electroweak Precision Tests satisfaction

  17. Note:The considered model may avoid the problem of the inert doublet one, which suffers from the inconsistency of the vacuum stability conditions with the requirement of cancellation of quadratic divergences. • However the fine turning is needed to satisfy the cancellation of the divergences at large scales.

  18. Model

  19. Results

  20. Conclusion We have investigated a simple extension of the SM to explain the neutrino masses, the observed BAU, DM and lithium abundances in the universe. The proposed model satisfies the electroweak precision constraints and is testable in the forthcoming collider experiments. We have separated the new fermions in this model into two classes under the Z2 transformations to explain the PAMELA/Fermi positron/electron excesses in cosmic rays. Note that in the considered class of models it is possible to explain the measured value of the muon g-2.

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