Against the conventional picture that the mass matrix forms in the quark sectors will take somewhat different structures from those in the lepton sectors, on the basis of the idea that all the mass matrices of quarks and leptons have the same texture, a universal texture of quark and lepton mass matrices is proposed by assuming a discrete symmetry $Z_3$ and an extended flavor $2\leftrightarrow 3$ symmetry. The texture is described by three parameters (including the phase parameter). The neutrino masses and mixings are investigated according to this ansatz.

• Received 16 December 2003

DOI:https://doi.org/10.1103/PhysRevD.69.093001