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
Abstract
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 Nf=2 dynamical flavours. Preliminary results are presented for the four-fermion operator which determines the BK parameter in tmQCD.
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