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We calculate in QCD$_2$ the ratios of baryonic matrix elements of $\Delta I =2$ and $\Delta I = 0$ four-fermion operators, with a view to understandingbetter the mechanism of $\Delta I = 1/2$ enhancement in QCD$_4$. We findrelatively small suppressions of both the scalar-scalar and vector-vector$\Delta I = 2$ four-fermion operators. We discuss the possible implications ofthese results, in view of a suggestion that gluon condensation may be animportant contributing factor in the $\Delta I = 1/2$ enhancement seen inQCD$_4$. At the technical level, our calculation of the vector-vector operatormatrix element requires a treatment of the time dependence of the QCD$_2$soliton which had not been developed in previous phenomenological calculationswithin this model.Comment: 1

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi><mml:mi>I</mml:mi><mml:mo>=</mml:mo></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>rule in the light of two-dimensional QCD

ΔI=12rule in the light of two-dimensional QCD