Cosmic $\Delta B$ from Lepton Violating Interactions at the Electroweak   Phase Transition
  We propose a new mechanism for late cosmological baryon asymmetry in models with first order electroweak phase transition. Lepton asymmetry arises through the decay of particles produced out of equilbrium in bubble collisions and is converted into baryon asymmetry by sphalerons. Supersymmetric models with explicitly broken R-parity may provide a suiatble framework for the implementation of this mechanism. 
Antonio Masiero and Antonio Riotto