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Paper   IPM / P / 7893
School of Physics
  Title:   R-Parity Violation Assisted Thermal Leptogenesis in the Seesaw Mechanism
1.  Y. Farzan
2.  J. W. F. Valle
  Status:   Published
  Journal: Phys. Rev. Lett.
  Vol.:  96
  Year:  2006
  Pages:   011601
  Supported by:  IPM
Successful leptogenesis within the simplest type I supersymmetric seesaw mechanism requires the lightest of the three right-handed neutrino supermultiplets to be heavier than  ∼ 109 GeV. Thermal production of such (s)neutrinos requires very high reheating temperatures which result in an overproduction of gravitinos with catastrophic consequences for the evolution of the universe. In this letter, we let R-parity be violated through a λi Ni Hu Hd term in the superpotential, where Ni are right-handed neutrino supermultiplets. We show that in the presence of this term, the produced lepton-antilepton asymmetry can be enhanced. As a result, even for N1 masses as low as 106 GeV or less, we can obtain the observed baryon asymmetry of the universe without gravitino overproduction

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