Abstract
We investigate through the dilute instanton gas approximation the long-distance properties of the (1+1)-dimensional electrodynamics with massless fermions and Higgs-like bosons. Generally fermions have a charge different from that of bosons and are confined. We find the “mesonic” and “baryonic” spectrum of the model. The fermions become free when their charge becomes equal to that of bosons. This first-order phase transition is investigated as well. The order parameter is found to be the fermion-antifermion condensate, which is zero in confining phase and nonzero in nonconfining phase. The effective long-distance Lagrangians in both phases are found.
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