Neutrino Parameter Space for a Vanishing $ee$ Element in the Neutrino   Mass Matrix
  The consequences of a texture zero at the $ee$ entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos. The neutrino parameter space under this condition has been constrained in the light of all available neutrino data including the CHOOZ bound on $s_{13}^{2}$. 
S. Dev and Sanjeev Kumar