Adding VSR-style Lorentz-invariant terms to two-dimensional QCD does not alter the 't Hooft meson spectrum; a gluon-mass regulator recovers the standard equation in the zero-mass limit.
A Planar Diagram Theory for Strong Interactions,
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Meson spectrum in $QCD_2$ revisited
Adding VSR-style Lorentz-invariant terms to two-dimensional QCD does not alter the 't Hooft meson spectrum; a gluon-mass regulator recovers the standard equation in the zero-mass limit.