✦ LIBER ✦

Gauge-dependent O.P.E. power corrections on the QCD coupling

✍ Scribed by Ph. Boucaud; F. De Soto; A. Donini; J.P. Leroy; A. Le Yaouanc; J. Micheli; H. Moutarde; O. Pène; J. Rodríguez-Quintero

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 314 KB
Volume: 121
Category: Article
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)01863-2

No coin nor oath required. For personal study only.

✦ Synopsis

The running coupling constant can be estimated by computing gluon two-and three-point Green functions from the lattice. Computing in lattice implies working in a fixed gauge sector (Landau). A source of systematic uncertainty is then the contribution of non gauge-invariant condensates, as (A2), generating power corrections that might still be important at very high energies. We study the impact of this gluon condensate on the analysis of lattice data and the estimate of Ax. We finally try the relationship of this condensate with topological properties of QCD through the instanton picture.

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