Speaker
Description
The $E_6$ inspired extension of the minimal supersymmetric (SUSY) standard model (MSSM) with an extra $U(1)_{N}$ gauge symmetry, under which right-handed neutrinos have zero charge, involves exotic matter beyond the MSSM to ensure anomaly cancellation. In particular, there are three families of extra exotic quarks and several $SU(2)_W$-doublets that have the quantum numbers of the MSSM Higgs doublets. We discuss the phenomenology of extra matter, whose discovery provides a smoking gun signal of this model (E$_6$SSM). We also consider the variant of the E$_6$SSM (SE$_6$SSM) in which a single discrete $\tilde{Z}^{H}_2$ symmetry permits suppressing rapid proton decay and non-diagonal flavor transitions. In the SE$_6$SSM the cold dark matter can be composed of the lightest neutral exotic fermion and gravitino. We argue that there are some regions of the SE$_6$SSM parameter space, which are safe from all current constraints, and discuss the implications of this model for collider phenomenology.
