NEW 4-QUARK DELTA-S=2 LOCAL OPERATOR
JF Donoghue, Eugene Golowich, German Valencia · ScholarWorks@UMassAmherst (University of Massachusetts Amherst) · 1986
We describe a new four-quark ΔS=2 local operator, which we dub the ‘‘dipenguin’’ operator. Its form is derived and its K¯ 0-to-K0 matrix element is estimated. Also, we comment upon bag-model evaluations of K¯ 0-to-K0 matrix elements of (V-A)×(V-A) operators.