Ghost-gluon running coupling, power corrections, and the determination of {lambda}{sub MS}

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.014508· OSTI ID:21254727

Boucaud, Ph; Leroy, J P; Le Yaouanc, A; Micheli, J; Pene, O ^[1]; De Soto, F ^[2]; Rodriguez-Quintero, J ^[3]

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1. Laboratoire de Physique Theorique et Hautes Energies Universite de Paris XI, Batiment 211, 91405 Orsay Cedex (France)
2. Dpto. Sistemas Fisicos, Quimicos y Naturales, Universidad Pablo de Olavide, 41013 Sevilla (Spain)
3. Dpto. Fisica Aplicada, Fac. Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain. (Spain)

We compute a formula including operator-product expansion power corrections to describe the running of a QCD coupling nonperturbatively defined through the ghost and gluon dressing functions. This turns out to be rather accurate. We propose the 'plateau' procedure to compute {lambda}{sub MS} from the lattice computation of the running coupling constant. We show a good agreement between the different methods which have been used to estimate {lambda}{sub MS}{sup N{sub f}}{sup =0}. We argue that {lambda}{sub MS} or the strong coupling constant computed with different lattice spacings may be used to estimate the lattice spacing ratio.

• OSTI ID: 21254727
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 1; Other Information: DOI: 10.1103/PhysRevD.79.014508; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRECTIONS
COUPLING
COUPLING CONSTANTS
GLUONS
LATTICE FIELD THEORY
OPERATOR PRODUCT EXPANSION
QUANTUM CHROMODYNAMICS
SIMULATION
STRONG-COUPLING MODEL