An SU(2)_L x SU(2)_R x U(1)_{B-L} model with two or three scalar bidoublets and two doublets keeps neutrinos Dirac and aims to remove the small-mass fine-tuning with a third bidoublet.
A Truly Minimal Left-Right Symmetric Extension of the Standard Model
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abstract
By invoking the existence of a general custodial O(2) symmetry, a minimal Left-Right symmetric model based on the gauge group G=SU(2)L SU(2)R U(1)BL is shown to require the existence of only two physical Higgs bosons. The lighter Higgs is predicted to have a small mass which could be evaluated by standard perturbation theory. The fermionic mass matrices are recovered by insertion of ad hoc fermion-Higgs interactions. The model is shown to be undistinguishable from the standard model at the currently reachable energies.
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Dirac neutrinos in a $SU(2)$ left-right symmetric model
An SU(2)_L x SU(2)_R x U(1)_{B-L} model with two or three scalar bidoublets and two doublets keeps neutrinos Dirac and aims to remove the small-mass fine-tuning with a third bidoublet.