The Scalar Sector in 331 Models
  We calculate the exact tree-level scalar mass matrices resulting from symmetry breaking using the most general gauge-invariant scalar potential of the 331 model, both with and without the condition that lepton number is conserved. Physical masses are also obtained in some cases, as well as couplings to standard and exotic gauge bosons. 
M. B. Tully and G. C. Joshi (University of Melbourne)