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.
Meson-Baryon Scattering in QCD_2 for any Coupling
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abstract
Extending earlier work on strong-coupling meson-baryon scattering in QCD_2, we derive the effective meson-baryon action for any value of the coupling constant, in the large-N_c limit. Colour degrees of freedom play an important role, and we show that meson-baryon scattering can be formulated as a relativistic potential problem. We distinguish two cases that are non-trivial for unequal quark masses, and present the resulting equations for meson-baryon scattering amplitudes.
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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.