렙토제네시스와 뉴트리노 유가와 행렬의 변환각도

초록

We analyze the neutrino Yukawa matrix by considering two constraints: the out-of-equilibrium condition of lepton number violating process responsible for leptogenesis and the prediction of large mixing angles using the see-saw mechanism. In a certain parametrization with bi-unitary transformation, it is shown that the structure which satisfies the constraints can be characterized by only 8 types of Yukawa matrices specifying the type of mixing angles and the relative comparison of their eigenvalues. We propose that this parametrization can be the framework in which the CP asymmetry of lepton number violating process can be predicted in terms of observable neutrino parameters at low energy , if necessary, under assumptions following from a theory with additional symmetries.