Remark on the minimal seesaw model and leptogenesis with tribimaximal mixing

We have studied a leptogenesis scenario in the framework of the minimal seesaw model with tribimaximal 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 nonzero b(2). Thus one can expect that more rich phenomena, such as an enhanced leptogenesis, are hidden in the b(2)not equal 0 space.