LHC Accessible Second Higgs Boson in the Left-Right Model

Abstract

A second Higgs doublet arises naturally as a parity partner of the standard model (SM) Higgs, once SM is extended to its left-right symmetric version (LRSM) to understand the origin of parity violation in weak interactions as well as to accommodate small neutrino masses via the seesaw mechanism. The flavor changing neutral Higgs (FCNH) effects in the minimal version of this model (LRSM), however, push the second Higgs mass to more than 15 TeV making it inaccessible at the LHC. Furthermore since the second Higgs mass is directly linked to the $W_R$ mass, discovery of a "low" mass $W_R$ ($M_{W_R}\le 5-6$ TeV) at the LHC would require values for some Higgs self couplings larger than one. In this paper we present an extension of LRSM by adding a vector-like $SU(2{)}_R$ quark doublet which weakens the FCNH constraints allowing the second Higgs mass to be near or below TeV and a third neutral Higgs below 3 TeV for a $W_R$ mass below 5 TeV. It is then possible to search for these heavier Higgs bosons at the LHC, without conflicting with FCNH constraints. A right handed $W_R$ mass in the few TeV range is quite natural in this class of models without having to resort to large scalar coupling parameters. The CKM mixings are intimately linked to the vector-like quark mixings with the known quarks, which is the main reason why the constraints on the second Higgs mass is relaxed. We present a detailed theoretical and phenomenological analysis of this extended LR model and point out some tests as well as its potential for discovery of a second Higgs at the LHC. Two additional features of the model are: (i) a 5/3 charged quark and (ii) a fermionic top partner with masses in the TeV range.

22 pages, 4 figures, lots of stuff moved to the appendices, errors and typos corrected, version to appear in PRD

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• Characters and Group Invariant Polynomials of (Super)fields: Road to "Lagrangian"
• Subdominant Left-Right Scalar Dark Matter as Origin of the 750 GeV Di-photon Excess at LHC
• Dedicated Strategies for Triboson Signals from Cascade Decays of Vector Resonances
• Hilbert Series and Plethystics: Paving the path towards 2HDM- and MLRSM-EFT
• Perspectives for Detecting Lepton Flavour Violation in Left-Right Symmetric Models
• Ameliorating Higgs Induced Flavor Constraints on TeV Scale $W_R$
• Neutrino phenomenology in a left-right $D_4$ symmetric model
• Search for like-sign dileptons plus two jets signal in the framework of the manifest left-right symmetric model
• Electroweak-like Baryogenesis with New Chiral Matter