Non-perturbative scale evolution of four-fermion operators in two-flavour QCD

ALPHA Collaboration: P. Dimopoulos , G. Herdoiza , F. Palombi , C. Pena , S. Sint , A. Vladikas

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classification ✦ hep-lat

keywords four-fermionoperatorsappearapplycalculationsdeltadeterminedetermines

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We apply finite-size recursion techniques based on the Schrodinger functional formalism to determine the renormalization group running of four-fermion operators which appear in the Delta S=2 effective weak Hamiltonian of the Standard Model. Our calculations are done using O(a) improved Wilson fermions with N_f=2 dynamical flavours. Preliminary results are presented for the four-fermion operator which determines the B_K parameter in tmQCD.

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Non-perturbative scale evolution of four-fermion operators in two-flavour QCD

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