Chiral-Symmetry and Strange Four-Quark Matrix Elements
arXiv:hep-ph/9307234 · doi:10.1016/0370-2693(93)91212-6
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 $ÎI = 1/2$ rule of hyperon and kaon non-leptonic weak decay implies possible large strange-quark content in the nucleon and pion.
10 pages in Plain TeX, MIT CTP #2188