Computing the perturbative gluon condensate | Zendy

G. Grunberg | Zendy

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Computing the perturbative gluon condensate

Author(s) -

G. Grunberg

Publication year - 2001

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2001/07/033

Subject(s) - renormalon , physics , gluon condensate , coupling (piping) , gluon , quantum electrodynamics , quantum chromodynamics , normalization (sociology) , perturbative qcd , coupling parameter , particle physics , statistical physics , quantum mechanics , mechanical engineering , sociology , anthropology , engineering

The normalization of the gluon condensate and of renormalon-related powercorrections in QCD is computed under the assumption that their ``perturbative''part dominates over any eventual extra contribution from the non-trivialvacuum. The calculation is performed in the infrared finite coupling framework,assuming an infrared fixed point is present in the perturbative coupling downto low values of N_f. The freezing perturbative coupling is reconstructed usinga Banks-Zaks expansion approach. Parameter-free predictions of the low energymoments of the coupling, which determine the process-independent part of thepower corrections, are obtained for a number of choices of the runningcoupling.Comment: 16 pages, 2 figures, JHEP style. JHEP version: further comparison and discussion of the discrepancy with the standard SVZ procedure is given (mainly in section 4

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