Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-30
Phys.Lett. B517 (2001) 215-221
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(01)00971-6
The large-order behaviour of QCD is dominated by renormalons. On the other hand renormalons do not occur in conformal theories, such as the one describing the infrared fixed-point of QCD at small beta_0 (the Banks--Zaks limit). Since the fixed-point has a perturbative realization, all-order perturbative relations exist between the conformal coefficients, which are renormalon-free, and the standard perturbative coefficients, which contain renormalons. Therefore, an explicit cancellation of renormalons should occur in these relations. The absence of renormalons in the conformal limit can thus be seen as a constraint on the structure of the QCD perturbative expansion. We show that the conformal constraint is non-trivial: a generic model for the large-order behaviour violates it. We also analyse a specific example, based on a renormalon-type integral over the two-loop running-coupling, where the required cancellation does occur.
Gardi Einan
Grunberg Georges
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