Constraining the gauge and scalar sectors of the doublet left-right symmetric model

Abstract

We consider a left-right symmetric extension of the Standard Model where the spontaneous breakdown of the left-right symmetry is triggered by doublets. The electroweak $\rho$ parameter is protected from large corrections in this Doublet Left-Right Model (DLRM), contrary to the triplet case. This allows in principle for more diverse patterns of symmetry breaking. We consider several constraints on the gauge and scalar sectors of DLRM: the unitarity of scattering processes involving gauge bosons with longitudinal polarisations, the radiative corrections to the muon $\Delta r$ parameter and the electroweak precision observables measured at the $Z$ pole and at low energies. Combining these constraints within the frequentist CKMfitter approach, we see that the fit pushes the scale of left-right symmetry breaking up to a few TeV, while favouring an electroweak symmetry breaking triggered not only by the $SU(2{)}_L\times SU(2{)}_R$ bi-doublet, which is the case most commonly considered in the literature, but also by the $SU(2{)}_L$ doublet.

Reviewed version, version published by JHEP, v2 extends discussion on direct searches of WR gauge bosons

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Cited by in corpus (8)

• A low-energy perspective on the minimal left-right symmetric model
• Observing Left-Right Symmetry in the Cosmic Microwave Background
• Probing Left-Right Symmetry via Gravitational Waves from Domain Walls
• Long-lived heavy neutral leptons at lepton colliders as a probe of left-right symmetric models
• Constraints on the Doublet Left-Right Symmetric Model from Higgs data
• The Electric Dipole Moment of the electron in the decoupling limit of the aligned Two-Higgs Doublet Model
• The $Zb\bar{b}$ vertex in a left-right model
• Right-Handed Leptonic Mixing and Enhancement Band in Left-Right Symmetry