In this paper, we review the actual situation of electroweak breaking theories concerning their capabilities to generate the baryon asymmetry of the universe at the electroweak phase transition. First of all we consider the case of the standard model which, in spite of possessing all necessary ingredients, is unable to produce the observed amount of baryon asymmetry. This fact is enough to motivate the existence of physics beyond the standard model. We then present the situation in the minimal supersymmetric extension of the standard model (MSSM) where, only if the Higgs is on the verge of experimental detection and the right-handed stop is lighter than the top quark, the baryon asymmetry of the universe could be likely generated in agreement with observations. Otherwise one should go beyond the MSSM, either by splitting supersymmetry or by assuming the existence of new fields strongly coupled to the Higgs sector. One such model is provided as an example. © 2007 IOP Publishing Ltd.
|Journal||Journal of Physics A: Mathematical and Theoretical|
|Publication status||Published - 22 Jun 2007|