Left-Right Symmetric Model without Higgs Triplets

Abstract

We develop a minimal left-right symmetric model based on the gauge group $SU(3{)}_C\otimes SU(2{)}_L\otimes SU(2{)}_R\otimes U(1{)}_{B-L}$ wherein the Higgs triplets conventionally employed for symmetry breaking are replaced by Higgs doublets. Majorana masses for the right-handed neutrinos $({\nu }_R$) are induced via two-loop diagrams involving a charged scalar field ${\eta }^{+}$. This setup is shown to provide excellent fits to neutrino oscillation data via the seesaw mechanism for the entire range of the $W_R^{\pm }$ mass, from TeV to the GUT scale. When the $W_R^{\pm }$ mass is at the TeV scale, the ${\nu }_R$ masses turn out to be in the MeV range. We analyze constraints from low energy experiments, early universe cosmology and from supernova 1987a on such a scenario and show its consistency. We also study collider implications of a relatively light ${\eta }^{+}$ scalar through its decay into multi-lepton final states and derive a lower limit of 390 GeV on its mass from the LHC, which can be improved to 555 GeV in its high luminosity run.

44 pages and references, 10 figures

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