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arxiv 1902.05802 v2 pith:FKMU6IIP submitted 2019-02-15 hep-ph

Alternative formulation of left-right symmetry with B-L conservation and purely Dirac neutrinos

classification hep-ph
keywords symmetrydiracformulationleft-rightalternativeglobalmassesmechanism
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We propose an alternative formulation of a Left-Right Symmetric Model (LRSM) where the difference between baryon number ($B$) and lepton number ($L$) remains an unbroken symmetry. This is unlike the conventional formulation, where $B-L$ is promoted to a local symmetry and is broken explicitly in order to generate Majorana neutrino masses. In our case $B-L$ remains a global symmetry after the left-right symmetry breaking, allowing only Dirac mass terms for neutrinos. In addition to parity restoration at some high scale, this formulation provides a natural framework to explain $B-L$ as an anomaly-free global symmetry of the Standard Model and the non-observation of $(B-L)$-violating processes. Neutrino masses are purely Dirac type and are generated either through a two loop radiative mechanism or by implementing a Dirac seesaw mechanism.

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Cited by 1 Pith paper

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  1. Probing Quasi-Dirac Neutrino Oscillations at Long Baseline Experiments

    hep-ph 2026-07 conditional novelty 4.0

    GLoBES simulations show that DUNE can probe quasi-Dirac sterile-neutrino mixing down to θ_sa ≈ 0.05 with uniform coverage, while current NOvA+T2K data constrains θ_sa ≳ 0.08.