Remark on the minimal seesaw model and leptogenesis with tri/bi-maximal mixing

Abstract

We have studied a leptogenesis scenario in the framework of the minimal seesaw model with tri/bi-maximal mixing. Usually, at least one of the elements in the Dirac mass matrix is fixed to be zero, for example, we denote it by $b_2=0$. We have pointed out that the absolute value of the CP asymmetry has several minimums and maximums with non-zero $b_2$. Thus one can expect that more rich phenomena, such as an enhanced leptogenesis, are hidden in the $b_2\ne 0$ space.

arXiv comment9 pages, 7 figures, uses RevTex4. To appear in Physcal Review D

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