The Neutralino Sector in the U(1)-Extended Supersymmetric Standard Model

Abstract

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.

50 pages, 9 figures, equations.sty included

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• Higgs Sector in Extensions of the MSSM
• Illuminating the Hidden Sector of String Theory by Shining Light through a Magnetic Field
• Collider Signatures of Singlet Extended Higgs Sectors
• Neutralino Signatures of the Singlet Extended MSSM
• Routines for the diagonalization of complex matrices

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• Non-Standard Higgs Decays in U(1) Extensions of the MSSM
• Precision measurements, dark matter direct detection and LHC Higgs searches in a constrained NMSSM
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• Dark matter candidates in the constrained Exceptional Supersymmetric Standard Model
• Wedgebox analysis of four-lepton events from neutralino pair production at the LHC
• Diphoton Rate of the Standard-Model-Like Higgs Boson in the Extra U(1) Extended MSSM
• Testing a U(1) Solution to the Mu Problem
• Search for Gauge Extensions of the MSSM at the LHC
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• Light Neutralino Dark Matter in $U(1{)}^{\prime }$ models
• Electric Dipole Moments in U(1)' Models
• Effective field theory analysis of composite higgsino-like and wino-like thermal relic dark matter
• Complementarity of the CERN Large Hadron Collider and the $e^{+}{e}^{-}$ International Linear Collider
• Complementarity of LHC and ILC
• A Review of the Exceptional Supersymmetric Standard Model
• Interactions of exotic neutralino dark matter with nucleons in $U(1)$ extensions of the MSSM originating from $E_6$ GUTs