Xing, ZZ (reprint author), Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
We propose a novel neutrino mixing pattern in terms of only two small integers 1 and 2 together with their square roots and the imaginary number i. This ansatz is referred to as the "tetra-maximal" mixing because it can be expressed as a product of four rotation matrices, whose mixing angles are all pi/4 in the complex plane. It predicts theta(12) = arctan(2 - root 2) approximate to 30.4 degrees, theta(13) = arcsin[(root 2 - 1)/(2 root 2)] approximate to 8.4 degrees, theta(23) = 45 degrees and delta = 90 degrees in the standard parametrization, and the Jarlskog invariant of leptonic CP violation is found to be J = 1/32. These results are compatible with current data and can soon be tested in a variety of neutrino oscillation experiments. Implications of the tetra-maximal neutrino mixing on the decays of doubly-charged Higgs bosons H(+/-+/-) -> l(alpha)(+/-)l(beta)(+/-) (for alpha, beta = e, mu, tau) are also discussed in the triplet seesaw mechanism at the TeV scale, which will be explored at the upcoming LHC.