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Decoupling, Lepton-Flavour Violation and Leptogenesis

Decoupling, Lepton-Flavour Violation and Leptogenesis. Krzysztof Turzyński Institute of Theoretical Physics, Warsaw University.

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Decoupling, Lepton-Flavour Violation and Leptogenesis

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  1. Decoupling,Lepton-Flavour Violationand Leptogenesis Krzysztof Turzyński Institute of Theoretical Physics, Warsaw University • Chankowski, kt, Phys. Lett.B570 (2003) 198• kt, Phys. Lett.B589 (2004) 135• Chankowski, Ellis, Pokorski, Raidal, kt, Nucl. Phys. B690 (2004) 279• Raidal, Strumia, kt, Phys. Lett.B609 (2005) 351

  2. Seesaw mechanism Hierarchical neutrino masses + large mixing angles unnatural, unless: texture zeros in neutrino Yukawa couplingsdecoupling of one singlet neutrino NA = dominance of the other two

  3. Seesaw mechanism General parametrization of neutrino Yukawa couplings: For N1 decoupled:

  4. < Lepton-flavour violation e unobservable for M < 1011GeV

  5. Leptogenesis Early Universe: N1‘s become nonrelativistic and decay rapidly due to CP asymmetry in these decays a net L asymmetry can be produced and transformed into B asymmetry in sphaleron transitions Davidson-Ibarra bound: WMAP 

  6. log10(M1/GeV) 5 6 7 8 9 10 11 12 13 Leptogenesis standard thermal leptogenesis with a heavy singlet neutrino decoupled OK (Chankowski & kt, 2003) gravitino decays do not spoil BBN (neutralino dark matter) neutralino decays do not spoil BBN (gravitino dark matter) standard thermal leptogenesis with DI bound OK

  7. specific models with decoupling Leptogenesis vs LFV sneutrino-driven chaotic inflation e probably observable in the next round of exps.(Chankowski et al.,2004) nonthermal leptogenesis in inflaton decay enhancement of 1 from small mass splittings of singlet neutrinos partly compensated due to consistency conditions, but leptogenesis OK e unobservable masses of 2 singlet neutrinos degenerate at the GUT scale (kt,2004) large neutrino Yukawa couplings cancelling out in the seesaw formula(Raidal et al.,2005) successful leptogenesis from small M1 due to overcoming DI bound

  8. specific models with decoupling Leptogenesis vs LFV sneutrino-driven chaotic inflation e probably observable in the next round of exps.(Chankowski et al.,2004) nonthermal leptogenesis in inflaton decay enhancement of 1 from small mass splittings of singlet neutrinos partly compensated due to consistency conditions, but leptogenesis OK e unobservable masses of 2 singlet neutrinos degenerate at the GUT scale (kt,2004) large neutrino Yukawa couplings cancelling out in the seesaw formula(Raidal et al.,2005) successful leptogenesis from small M1 due to overcoming DI bound

  9. specific models with decoupling Leptogenesis vs LFV sneutrino-driven chaotic inflation e probably observable in the next round of exps.(Chankowski et al.,2004) nonthermal leptogenesis in inflaton decay enhancement of 1 from small mass splittings of singlet neutrinos partly compensated due to consistency conditions, but leptogenesis OK e unobservable masses of 2 singlet neutrinos degenerate at the GUT scale (kt,2004) large neutrino Yukawa couplings cancelling out in the seesaw formula(Raidal et al.,2005) successful leptogenesis from small M1 due to overcoming DI bound r=1 form0=100 GeV, M1/2=200 GeV

  10. Instead of conclusions sneutrino-driven chaotic inflation e probably observable in the next round of exps.(Chankowski et al.,2004) nonthermal leptogenesis in inflaton decay enhancement of 1 from small mass splittings of singlet neutrinos partly compensated due to consistency conditions, but leptogenesis OK e unobservable masses of 2 singlet neutrinos degenerate at the GUT scale (kt,2004) large neutrino Yukawa couplings cancelling out in the seesaw formula(Raidal et al.,2005) successful leptogenesis from small M1 due to overcoming DI bound r=1 form0=100 GeV, M1/2=200 GeV

  11. Instead of conclusions sneutrino-driven chaotic inflation e probably observable in the next round of exps.(Chankowski et al.,2004) nonthermal leptogenesis in inflaton decay ‘It is a capital mistake to theorize before one has data’ enhancement of 1 from small mass splittings of singlet neutrinos partly compensated due to consistency conditions, but leptogenesis OK e unobservable masses of 2 singlet neutrinos degenerate at the GUT scale (kt,2004) large neutrino Yukawa couplings cancelling out in the seesaw formula(Raidal et al.,2005) successful leptogenesis from small M1 due to overcoming DI bound r=1 form0=100 GeV, M1/2=200 GeV

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