This paper is a first report on the determination of Λ\msbar from lattice simulations with 2+1+1 twisted-mass dynamical flavours {\it via} the computation of the ghost-gluon coupling renormalized in the MOM Taylor scheme. We show this approach allows a very good control of the lattice artefacts and confirm the picture from previous works with quenched and Nf=2 twisted-mass field configurations which prove the necessity to include non-perturbative power corrections in the description of the running. We provide with an estimate of Λ\msbar in very good agreement with experimental results. To our knowledge it is the first calculation with a dynamical charm quark which makes the running up to αs(MZ) much safer.
@article{arxiv.1110.5829,
title = {Ghost-gluon coupling, power corrections and $\Lambda_{\bar{\rm MS}}$ from lattice QCD with a dynamical charm},
author = {B. Blossier and Ph. Boucaud and M. Brinet and F. De Soto and X. Du and M. Gravina and V. Morenas and O. Pène and K. Petrov and J. Rodríguez-Quintero},
journal= {arXiv preprint arXiv:1110.5829},
year = {2015}
}
Comments
11 pages, 3 figures, 3 tables (new version accepted to be published in Phys. Rev. D)