2006/12/18 by S. Y. Choi, S. Choi, Howard E. Haber +4
Physics and Astronomy · #Black Holes and Theoretical Physics #Gauge (firearms) #Higgs boson #Higgs sector #Minimal Supersymmetric Standard Model #Mixing (physics) #Neutralino #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Standard Model (mathematical formulation) #Supersymmetry #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2007.04.019
published as Nucl.Phys.B778:85-128,2007 · 50 pages, 9 figures, equations.sty included
arxiv created 2006/12/18 · openalex publication_date 2007/04/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Motivated by grand unified theories and string theories we analyze the general structure of the neutralino sector in the USSM, an extension of the minimal supersymmetric Standard Model that involves a broken extra U(1) gauge symmetry. This supersymmetric U(1)-extended model includes an Abelian gauge superfield and a Higgs singlet superfield in addition to the standard gauge and Higgs superfields of the MSSM. The interactions between the MSSM fields and the new fields are in general weak and the mixing is small, so that the coupling of the two subsystems can be treated perturbatively. As a result, the mass spectrum and mixing matrix in the neutralino sector can be analyzed analytically and the structure of this 6-state system is under good theoretical control. We describe the decay modes of the new states and the impact of this extension on decays of the original MSSM neutralinos, including radiative transitions in cross-over zones. Production channels in cascade decays at the LHC and pair production at e+e− colliders are also discussed.