Non-perturbative renormalisation of left-left four-fermion operators with Neuberger fermions
arXiv:hep-lat/0607028 · doi:10.1016/j.physletb.2006.08.009
Abstract
We outline a general strategy for the non-perturbative renormalisation of composite operators in discretisations based on Neuberger fermions, via a matching to results obtained with Wilson-type fermions. As an application, we consider the renormalisation of the four-quark operators entering the Delta S=1 and Delta S=2 effective Hamiltonians. Our results are an essential ingredient for the determination of the low-energy constants governing non-leptonic kaon decays.
14 pages, 3 figures