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Ghost-gluon running coupling, power corrections, and the determination of Λ(MS)over-bar

PHYSICAL REVIEW D (2009)

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PHYSICAL REVIEW D
卷 79, 期 1, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.014508

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Astronomy & Astrophysics Physics, Particles & Fields

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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 Delta(MS) over bar 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 (Nf= 0)((MS) over bar). We argue that Lambda(MS) over bar or the strong coupling constant computed with different lattice spacings may be used to estimate the lattice spacing ratio.

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