The thrust and heavy-jet mass distributions in the two-jet region

Abstract

Dressed Gluon Exponentiation (DGE) is used to calculate the thrust and the heavy-jet mass distributions in e+e- annihilation in the two-jet region. We perform a detailed analysis of power corrections, taking care of the effect of hadron masses on the measured observables. In DGE the Sudakov exponent is calculated in a renormalization-scale invariant way using renormalon resummation. Neglecting the correlation between the hemispheres in the two-jet region, we express the thrust and the heavy-jet mass distributions in terms of the single-jet mass distribution. This leads to a simple description of the hadronization corrections to both distributions in terms of a single shape function, whose general properties are deduced from renormalon ambiguities. Matching the resummed result with the available next-to-leading order calculation, we get a good description of the thrust distribution in a wide range, whereas the description of the heavy-jet mass distribution, which is more sensitive to the approximation of the phase space, is restricted to the range rho_H<1/6. This significantly limits the possibility to determine alpha_s from this observable. However, fixing alpha_s by the thrust analysis, we show that the power corrections for the two observables are in good agreement.

minor modifications; 46 pages, 11 post-script figures; to appear in Nucl. Phys. B

References in corpus (6)

• Resummation of non-global QCD observables
• Hadron masses and power corrections to event shapes
• Energy flow in QCD and event shape functions
• Renormalon resummation and exponentiation of soft and collinear gluon radiation in the thrust distribution
• Dressed gluon exponentiation
• Tests of Power Corrections for Event Shapes in e+e- Annihilation

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