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We propose a novel neutrino mixing pattern in terms of only two smallintegers 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 beexpressed as a product of four rotation matrices, whose mixing angles are all\pi/4 in the complex plane. It predicts \theta_{12} = \arctan(2-\sqrt{2})\approx 30.4^\circ, \theta_{13} = \arcsin[(\sqrt{2}-1)/(2\sqrt{2})] \approx8.4^\circ, \theta_{23} = 45^\circ and \delta =90^\circ in the standardparametrization, and the Jarlskog invariant of leptonic CP violation is foundto be {\cal J} = 1/32. These results are compatible with current data and cansoon be tested in a variety of neutrino oscillation experiments. Implicationsof the tetra-maximal neutrino mixing on the decays of doubly-charged Higgsbosons H^{\pm\pm} -> l^\pm_\alpha l^\pm_\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.

Tetra-maximal Neutrino Mixing and Its Implications on Neutrino Oscillations and Collider Signatures