Chiral-Symmetry and Strange Four-Quark Matrix Elements
Abstract
We consider the matrix elements of the left-handed flavor-conserving four-quark operators in the nucleon and pion states. Using chiral symmetry, we derive relationships among these matrix elements. We argue that the I = 1/2 rule of hyperon and kaon non-leptonic weak decay implies possible large strange-quark content in the nucleon and pion.
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