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.
@article{arxiv.hep-lat/0607028,
title = {Non-perturbative renormalisation of left-left four-fermion operators with Neuberger fermions},
author = {P. Dimopoulos and L. Giusti and P. Hernandez and F. Palombi and C. Pena and A. Vladikas and J. Wennekers and H. Wittig},
journal= {arXiv preprint arXiv:hep-lat/0607028},
year = {2009}
}