Classification of four-quark operators with $\Delta F\le 2$ under flavor symmetry and their renormalization in a gauge-invariant scheme

Gregoris Spanoudes, Marios Costa, Kyproulla Mitsidi +1

In this paper we study a complete set of scalar and pseudoscalar four-quark operators, with a particular emphasis on their renormalization within a Gauge-Invariant Renormalization…