Vacuum Structure of Alternative Left-Right Model

Abstract

We investigate an Alternative Left-Right Model (ALRM) with $SU(2{)}_L$ as well as $SU(2{)}_R$ gauge groups, but unlike the traditional left-right symmetric models (LRSM) is not symmetric under the exchange of the fermion content. Interestingly, it can be embedded in $E_6$, while its low energy Higgs structure resembles the LRSM, involving Higgs doublets ${\chi }_{L,R}$ and one Higgs bidoublet $\Phi$. We analyze the scalar potential and the vacuum structure of the theory analytically to ensure the stability of scalar potential via bounded from below (BFB) and copositivity criteria, accompanied by a numerical study. We establish the necessary criteria for electric charge preserving vacua, yielding constraints on various coupling parameters of the theory. Finally we obtain constraints on the parameters of the model from collider data on the masses of the Higgs scalars.

arXiv comment30 pages, 10 figures, matches version accepted for publication in JHEP

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• Flavour-changing top quark decays in the alternative left-right model
• Constraints on the Doublet Left-Right Symmetric Model from Higgs data
• Dark Matter in the Alternative Left Right Model
• Leptonic probes of Alternative Left-Right Symmetric Models
• Vacuum Structure of an Extended Standard Model with $U(1{)}_D$ Symmetry