Leptogenesis from Neutralino Decay with Nonholomorphic R-Parity   Violation
  In supersymmetric models with lepton-number violation, hence also R-parity violation, it is easy to have realistic neutrino masses, but then leptogenesis becomes difficult to achieve. After explaining the general problems involved, we study the details of a model which escapes these constraints and generates a lepton asymmetry, which gets converted into the present observed baryon asymmetry of the Universe through the electroweak sphalerons. This model requires the presence of certain nonholomorphic R-parity violating terms. For completeness we also present the most general R-parity violating Lagrangian with soft nonholomorphic terms and study their consequences for the charged-scalar mass matrix. New contributions to neutrino masses in this scenario are discussed. 
Thomas Hambye (Frascati), Ernest Ma (UC, Riverside) and Utpal Sarkar   (Phys. Res. Lab., Ahmedabad & UC, Riverside)