Lattice measurement of \alpha_s with a realistic charm quark

B. Blossier; Ph. Boucaud; M. Brinet; F. De Soto; X. Du; V. Morenas; O. Pene; K. Petrov; J. Rodriguez-Quintero

HAL: in2p3-00738313, version 1

arXiv: 1210.1053

DOI: 10.1016/j.nuclphysbps.2012.12.017

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16th International Conference in Quantum ChromoDynamics (QCD12), Montpellier : France (2012)

Lattice measurement of \alpha_s with a realistic charm quark

B. Blossier¹, Ph. Boucaud¹, M. Brinet², F. De Soto, X. Du², V. Morenas³, O. Pene¹, K. Petrov⁴, J. Rodriguez-Quintero

(2013)

We report on an estimate of \alpha_s, renormalised in the MSbar scheme at the tau and Z^0 mass scales, by means of lattice QCD. Our major improvement compared to previous lattice calculations is that, for the first time, no perturbative treatment at the charm threshold has been required since we have used statistical samples of gluon fields built by incorporating the vacuum polarisation effects of u/d, s and c sea quarks. Extracting \alpha_s in the Taylor scheme from the lattice measurement of the ghost-ghost-gluon vertex, we obtain \alpha_s^{MSbar}(m^2_Z)=0.1200(14) and \alpha_s^{MSbar}(m^2_tau)=0.339(13).

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

4:	LAL - Laboratoire de l'Accélérateur Linéaire

Subject(s)

Physics/High Energy Physics - Lattice

Physics/High Energy Physics - Phenomenology

Fulltext link:

http://fr.arXiv.org/abs/1210.1053


in2p3-00738313, version 1
http://hal.in2p3.fr/in2p3-00738313
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From: Emmanuelle Vernay <>
Submitted on: Thursday, 4 October 2012 08:35:33
Updated on: Thursday, 18 April 2013 11:07:26