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In the light-front form of field theory, boost invariance is a manifestsymmetry. On the downside, parity and rotational invariance are not manifest,leaving the possibility that approximations or incorrect renormalization mightlead to violations of these symmetries for physical observables. In this paper,it is discussed how one can turn this deficiency into an advantage and utilizeparity violations (or the absence thereof) in practice for constrainingeffective light-front Hamiltonians. More precisely, we will identifyobservables that are both sensitive to parity violations and easily calculablenumerically in a non-perturbative framework and we will use these observablesto constrain the finite part of non-covariant counter-terms in effectivelight-front Hamiltonians.Comment: REVTEX, 9 page

Parity invariance and nonperturbative renormalization of effective light-front Hamiltonians