  A new approach to the study of the transition point in a class of two
dimensional Wess-Zumino models is presented. The method is based on the
calculation of rigorous lower bounds on the ground state energy density in the
infinite lattice limit. Such bounds are useful in the discussion of
supersymmetry phase transition. The transition point is then determined and
compared with recent results based on large-scale Green Function Monte Carlo
simulations with good agreement.
