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The renormalization factor and O(a) improvement coefficient of four-quarkoperators are calculated perturbatively for the improved Wilson fermion actionwith clover term and the Iwasaki gauge action. With an application to the$K\to\pi\pi$ decay amplitude in mind, the calculation is restricted to theparity odd operator, for which the operators are multiplicatively renormalizedwithout any mixing to operators that have different chiral structures.

Perturbative renormalization factors of four-quark operators for improved Wilson fermion action and Iwasaki gauge action