2014/01/31 by Rabindra N. Mohapatra, Yongchao Zhang · 19 citations
Physics and Astronomy · #Boson #Geography #Higgs boson #Higgs field #Higgs mechanism #Higgs sector #Large Hadron Collider #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Seesaw mechanism #Seesaw molecular geometry #Standard Model (mathematical formulation) #Top quark #hep-ph
paper · pdf · doi:10.1103/physrevd.89.055001
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 89(5) (American Physical Society) · 22 pages, 4 figures, lots of stuff moved to the appendices, errors and typos corrected, version to appear in PRD
arxiv created 2014/01/31 · openalex publication_date 2014/03/03 · arxiv updated 2014/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A second Higgs doublet arises naturally as a parity partner of the standard model (SM) Higgs, once the 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 WR mass, discovery of a ``low'' mass WR (M_WR\ensuremath≤5--6 TeV) at the LHC would require values for some Higgs self-couplings larger than 1. In this paper we present an extension of LRSM by adding a vectorlike SU(2)R quark doublet which weakens the FCNH constraints, allowing the second Higgs mass to be near or below the TeV range and a third neutral Higgs below 3 TeV for a WR 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 WR 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 vectorlike quark mixings with the known quarks, which is the main reason why the constraints on the second Higgs mass are relaxed. We present a detailed theoretical and phenomenological analysis of this extended left-right 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 a 5/3-charged quark and a fermionic top partner with masses in the TeV range.