HAL : in2p3-00636240, version 1
 arXiv : 1110.5829
 Physical Review D 85 (2012) 034503
 Ghost-gluon coupling, power corrections and $Λ_{\bar{\rm MS}}$ from lattice QCD with a dynamical charm
 (2012)
 This paper is a first report on the determination of $\Lambda_{\msbar}$ 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 ${\rm N}_f$=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 $\Lambda_{\msbar}$ 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 $\alpha_s(M_Z)$ much safer.
 Thème(s) : Physique/Physique des Hautes Energies - Réseau
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1110.5829
 in2p3-00636240, version 1 http://hal.in2p3.fr/in2p3-00636240 oai:hal.in2p3.fr:in2p3-00636240 Contributeur : Emmanuelle Vernay <> Soumis le : Jeudi 27 Octobre 2011, 08:57:46 Dernière modification le : Vendredi 10 Février 2012, 08:56:32