Bimaximal mixing
Bimaximal mixing refers to a proposed form of the lepton mixing matrix. It is characterized by the neutrino being a bimaximal mixture of and and being completely decoupled from the, i.e. a uniform mixture of and. The is consequently a uniform mixture of and. Other notable properties are the symmetries between the and flavours and and mass eigenstates and an absence of CP violation. The moduli squared of the matrix elements have to be:
According to PDG convention, bimaximal mixing corresponds to and, which produces following matrix:
Alternatively, and can be used, which corresponds to:
Phenomenology
The L/E flatness of the electron-like event ratio at Super-Kamiokande severely restricts the CP-conserving neutrino mixing matricesto the form:
Bimaximal mixing corresponds to. Tribimaximal mixing and golden-ratio mixing also correspond to an angle in the above parametrization. Bimaximal mixing, along with these other mixing schemes, have been falsified by a non-zero.