The Constrained E$_6$SSM
  We present a self--consistent $E_6$ inspired supersymmetric model with an extra $U(1)_{N}$ gauge symmetry under which right-handed neutrinos have zero charge. We explore the particle spectrum within the constrained version of this exceptional supersymmetric standard model (E$_6$SSM) and discuss its possible collider signatures. 
P. Athron, S. F. King, D. J. Miller, S. Moretti, R. Nevzorov