Non-perturbative scale evolution of four-fermion operators ∗

Abstract We apply the Schro¨dinger Functional (SF) formalism to determine the renormalisation group running of four-fermion operators which appear in the effective weak Hamiltonian of the Standard Model. Our calculations are done using Wilson fermions and the parity-odd components of the operators. Preliminary results are presented for the operatorOV A = (s¯γμd) (s¯γμγy5d).