A Review of the Exceptional Supersymmetric Standard Model

Symmetry

Roman Nevzorov¹  StephenF. King²  Stefano Moretti² 

[1] NRC Kurchatov Institute—ITEP, Moscow 117218, Russia;School of Physics and Astronomy, University of Southampton, Highfield SO17 1BJ, UK;

关键词: Grand Unified Theories;    supersymmetry;    Higgs bosons;   

DOI  :  10.3390/sym12040557

来源: DOAJ

【 摘 要 】

Local supersymmetry (SUSY) provides an attractive framework for the incorporation of gravity and unification of gauge interactions within Grand Unified Theories (GUTs). Its breakdown can lead to a variety of models with softly broken SUSY at low energies. In this review article, we focus on the SUSY extension of the Standard Model (SM) with an extra $U{\left(1\right)}_N$ gauge symmetry originating from a string-inspired $E_6$ GUTs. Only in this $U\left(1\right)$ extension of the minimal supersymmetric standard model (MSSM) can the right-handed neutrinos be superheavy, providing a mechanism for the baryon asymmetry generation. The particle content of this exceptional supersymmetric standard model (E ${}_6$ SSM) includes three 27 representations of the $E_6$ group, to ensure anomaly cancellation. In addition it also contains a pair of $SU{\left(2\right)}_W$ doublets as required for the unification of gauge couplings. Thus, E ${}_6$ SSM involves exotic matter beyond the MSSM. We consider symmetries that permit suppressing flavor changing processes and rapid proton decay, as well as gauge coupling unification, the gauge symmetry breaking and the spectrum of Higgs bosons in this model. The possible Large Hadron Collider (LHC) signatures caused by the presence of exotic states are also discussed.

【 授权许可】

Unknown