APPROXIMATE |∆I| = 1/2 RULE IN K → ππ DECAYS FROM ASYMPTOTIC QUARK-LINE DIAGRAM APPROACH

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Abstract
Approximate |∆I| = 1/2 rule in K → ππ decays is studied from a new dynamical perspective in which quark-line diagrams should only be associated with asymptotic single-hadron matrix elements of , and not with the whole amplitude. The asymptotic matrix elements of taken between ordinary mesons are found to satisfy the strict |∆I| = 1/2 rule. However, the contribution of the four-quark (QQ) type mesons leads explicitly to a small violation of the selection rule.

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