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Leptogenesis at the TeV Scale in Brane World Cosmology

Yoshimi Kanehata (Ochanomizu University) in collaboration with G.C. Cho and A. Sugamoto Joint Meeting of Pacific Region Particle Physics Communities October 29th - November 03rd ,2006 Sheraton Waikiki Hawaii. Leptogenesis at the TeV Scale in Brane World Cosmology. Baryon asymmetry.

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Leptogenesis at the TeV Scale in Brane World Cosmology

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  1. Yoshimi Kanehata (Ochanomizu University) in collaboration with G.C. Cho and A. Sugamoto Joint Meeting of Pacific Region Particle Physics Communities October 29th - November 03rd ,2006 Sheraton Waikiki Hawaii Leptogenesis at the TeV Scale in Brane World Cosmology

  2. Baryon asymmetry where, WMAP results (’03 observational data) the baryon asymmetry Thermal Leptogenesis (’86 M.Fukugita, T.Yanagida) Dynamic generation of lepton asymmetry Sphaleron effects the baryon asymmetry

  3. 108[GeV]scale Various Leptogenesis Models TeV scale Low-energy leptogenesis (’04 L.Boubekeur, T.Hambye, G.Senjanovic) Thermal leptogenesis (’86 M.Fukugita, T.Yanagida) standard model Leptogenesis at the TeV scale in the brane world Thermal leptogenesis in the brane world (’06 N.Okada, O.Seto) brane world

  4. Outline 1. Introduction 1) Boubekeur-Hambye-Senjanovic (BHS) model 2) Modified Friedmann equation in the brane world 2. Our model - BHS on a Brane 3. Results 4. Summary

  5. Soft SUSY breaking leptogenesis-BHS model- (’04 L.Boubekeur, T.Hambye, G.Senjanovic) 1) Low energy leptogenesis in MSSM with RH sneutrinos Lepton number 2) Soft SUSY breaking terms CP violation 3) Yukawa couplings are negligible 4) The source of neutrino mass is the radiative one-loop contribution

  6. : Higgs : charged slepton, : coupling constant, Soft SUSY breaking leptogenesis (’04 L. Boubekeur, T.Hambye, G.Senjanovic) CP asymmetry 1) neglect the effects produced by the 4 heaviest sneutrinos 2) consider the asymmetry produced by ) ( ) ( +

  7. : Higgs : charged slepton, : coupling constant, Soft SUSY breaking leptogenesis (’04 L. Boubekeur, T.Hambye, G.Senjanovic) CP asymmetry CP asymmetry is concerned with

  8. : CP asymmetry : dilution factor The baryon number depends on and Baryon asymmetryfrom lepton asymmetry The lepton asymmetry is produced by decay (I) The baryon asymmetry is generated via sphaleron effects (II) : the number of Higgs doublets From (I) and (II),

  9. K is the ratio ofdecay ratetoHubble constant { Dilution factor : d (E.W.Kolb, M.S.Turner : The Early Universe) ( Inverse decay is large) BHS model Dilution factor is concerned with

  10. Hubble Constant in brane world cosmology (’00 Pierre Binetruy,Cedric Deffayet,Ulrich Elwanger,David Langlois) : brane world cosmology era : standard cosmology era Transition temperature : 400 [GeV]

  11. Hubble Constant in brane world cosmology (’00 Pierre Binetruy,Cedric Deffayet,Ulrich Elwanger,David Langlois) : brane world cosmology era : standard cosmology era Transition temperature : 400 [GeV]

  12. WMAP results { Our model - BHS on a Brane The baryon asymmetry The CP asymmetry The dilution factor We investigated and to reproduce the baryon asymmetry from the observational data. [TeV], [TeV],

  13. WMAP [eV] Allowed range of from Excluded from neutrino mass constraints [TeV] [TeV]

  14. [eV] [GeV] Summary A possibility of the leptogenesis at the TeV-scale in brane world cosmology has been discussed. Our scenario is realized in brane world era ( [GeV] ) [TeV], [TeV] We find constraints on the model parameters from the WMAP data:

  15. 108[GeV]scale (high-energy) Comparison with BHS TeV scale (low-energy) Low-energyleptogenesis (’04 L.Boubekeur, T.Hambye, G.Senjanovic) Thermal leptogenesis (’86 M.Fukugita, T.Yanagida) standard model : one order larger Leptogenesis at the TeV scale in the brane world : one order smaller Thermal leptogenesis in the brane world (’06 N.Okada, O.Seto) brane world

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