Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-25
JHEP 9911 (1999) 016
Physics
High Energy Physics
High Energy Physics - Phenomenology
71 pages, 12 color postscript figures; Journal version with some corrections and clarifications in Sec. 5. Note in particular
Scientific paper
10.1088/1126-6708/1999/11/016
Infrared power corrections for Minkowskian QCD observables are analyzed in the framework of renormalon resummation, motivated by analogy with the skeleton expansion in QED and the BLM approach. Performing the ``massive gluon'' renormalon integral a renormalization scheme invariant result is obtained. Various regularizations of the integral are studied. In particular, we compare the infrared cutoff regularization with the standard principal value Borel sum and show that they yield equivalent results once power terms are included. As an example the average thrust < T > in e+e- annihilation is analyzed. We find that a major part of the discrepancy between the known next-to-leading order calculation and experiment can be explained by resummation of higher order perturbative terms. This fact does not preclude the infrared finite coupling interpretation with a substantial 1/Q power term. Fitting the regularized perturbative sum plus a 1/Q term to experimental data yields alpha_s^{MSbar}(M_Z) = 0.110 \pm 0.002.
Gardi Einan
Grunberg Georges
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