Strong running coupling at $\tau$ and $Z_0$ mass scales from lattice QCD

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

doi:10.1103/PhysRevLett.108.262002

Strong running coupling at $\tau$ and $Z_0$ mass scales from lattice QCD

B. Blossier ¹ Ph. Boucaud ¹ M. Brinet ² F. De Soto X. Du ² V. Morenas ³ O. Pène K. Petrov J. Rodríguez-Quintero

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]

2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

3 LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]

Abstract : This letter reports on the first computation, from data obtained in lattice QCD with $u,d,s$ and $c$ quarks in the sea, of the running strong coupling via the ghost-gluon coupling renormalized in the MOM Taylor scheme. We provide with estimates of $\alpha_{\bar{\rm MS}}(m_\tau^2)$ and $\alpha_{\bar{\rm MS}}(m_Z^2)$ (for which the inclusion of the dynamical charm quark makes the running much safer) in very good agreement with experimental results.

Document type :

Journal articles

Physical Review Letters, American Physical Society, 2012, 108, pp.262002. <10.1103/PhysRevLett.108.262002>

Domain :

Physics / High Energy Physics - Lattice

Physics / High Energy Physics - Phenomenology

http://hal.in2p3.fr/in2p3-00664197
Contributor : Emmanuelle Vernay <>
Submitted on : Monday, January 30, 2012 - 9:14:30 AM
Last modification on : Wednesday, June 27, 2012 - 8:59:51 AM

Strong running coupling at $\tau$ and $Z_0$ mass scales from lattice QCD

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