Overview of Electroweak Baryogenesis

Clarification of the origin of the BAU is one of the greatest challenges in particle physics and cosmology. If the BAU is generated before T = O(1) MeV, the light element abundances (D,He,He,Li) can be explained by the standard Big-Bang cosmology. To get the right η (which is called baryogenesis) from an initially baryon symmetric universe, the so-called Sakharov’s conditions should be satisfied [2]: (i) baryon number (B) violation, (ii) C and CP violation, (iii) departure from thermal equilibrium. To this end, a lot of scenarios have been proposed so far [3]. From an experimental point of view, electroweak baryogenesis (EWBG) [4] among others is the most testable scenario, and thus it is in urgent need of detailed analysis in the LHC and future ILC eras. Since it is not very trivial to satisfy all the Sakharov’s conditions within the EWBG framework, some distinctive features are required in the feasible region and thus may yield striking signals to the low energy observables. In this talk, the EWBG is reviewed focusing especially on nondecoupling loop properties of scalar particles that may help for realizing the strong first-order phase transition (EWPT). As a consequence of the nondecoupling scalar loop, quantum corrections to the triple Higgs boson coupling is discussed.