Power corrections and renormalon resummation for the average thrust

Details Power corrections and renormalon resummation for the average thrust Power corrections and renormalon resummation for the average thrust

1999-09-02

arxiv.org/abs/hep-ph/9909226v1

Nucl.Phys.Proc.Suppl. 86 (2000) 426-429

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given by E. Gardi at the QCD'99 conference, Montpellier, July 1999. 4 pages, 3 figures

Scientific paper

10.1016/S0920-5632(00)00599-5

Infrared power corrections for the average thrust < T > in e+e- annihilation 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. We find that a major part of the discrepancy between the known next-to-leading order (NLO) 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 0.006.

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