  We examine minimal seesaw mechanism in which the masses of light neutrinos
are described with tri/bi-maximal mixing in the basis where the charged-lepton
Yukawa matrix and heavy Majorana neutrino mass matrix are diagonal. We search
for all possible Dirac mass textures which contain at least one zero entry in
$3 \times 2$ matrix and evaluate the corresponding lepton asymmetries. We
present the baryon asymmetry in terms of a single low energy unknown, a
Majorana CP phase to be clued from neutrinoless double beta decay.
