We present the first lattice calculation of the B-meson binding energy \labar and of the kinetic energy λ1/2mQ of the heavy-quark inside the pseudoscalar B-meson. In order to cancel the ambiguities due to the ultraviolet renormalons present in the operator matrix elements, this calculation has required the non-perturbative subtraction of the power divergences present in the Lagrangian operator \energy and in the kinetic energy operator \kkinetic. The non-perturbative renormalization of the relevant operators has been implemented by imposing suitable renormalization conditions on quark matrix elements in the Landau gauge.
@article{arxiv.hep-lat/9412049,
title = {Renormalons on the Lattice},
author = {M. Crisafulli and V. Gimenez and G. Martinelli and C. T. Sachrajda},
journal= {arXiv preprint arXiv:hep-lat/9412049},
year = {2009}
}