HAL : in2p3-00636240, version 1

arXiv : 1110.5829

DOI : 10.1103/PhysRevD.85.034503

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Physical Review D 85 (2012) 034503

Ghost-gluon coupling, power corrections and $Λ_{\bar{\rm MS}}$ from lattice QCD with a dynamical charm

B. Blossier1, Ph. Boucaud1, M. Brinet2, F. De Soto, X. Du2, M. Gravina, V. Morenas3, O. Pène, K. Petrov, J. Rodríguez-Quintero

(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.

1 :	LPT - Laboratoire de Physique Théorique d'Orsay
2 :	LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 :	LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand

Thème(s)

:

Physique/Physique des Hautes Energies - Réseau

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Contributeur : Emmanuelle Vernay <>

Soumis le : Jeudi 27 Octobre 2011, 08:57:46

Dernière modification le : Vendredi 10 Février 2012, 08:56:32