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arXiv · 2603.19462

Right-Handed Leptonic Mixing and Enhancement Band in Left-Right Symmetry

Vladimir Tello
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Abstract

Left-right (LR) symmetric theories predict right-handed charged currents whose flavor structure encodes the realization of parity. While the right-handed quark mixing matrix closely tracks its left-handed counterpart, the leptonic sector with purely Dirac neutrinos has remained structurally unclear. We show that, in contrast to the quark case, parity in the Dirac leptonic sector admits a localized, branch-dependent enhancement band in which RH-LH misalignment becomes parametrically large despite small parity breaking. We derive analytic solutions of the LR consistency equation and demonstrate that the interplay between spontaneous parity violation and spectral near-degeneracies leads to a qualitatively new pattern of right-handed mixing. This establishes the Dirac leptonic sector of the minimal LR model as a predictive and structurally distinct regime.

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Vladimir Tello. 2026-03-19. Right-Handed Leptonic Mixing and Enhancement Band in Left-Right Symmetry. https://doi.org/10.1103/4d6w-6vzf

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