NNLO corrections to event shapes in e+e- annihilation

被引：62

作者：

Ridder, A. Gehrmann-De ^{[1
]}

Gehrmann, T. ^{[2
]}

Glover, E. W. N. ^{[3
]}

Heinrich, G. ^{[4
]}

机构：

[1] ETH, Inst Theoret Phys, CH-8093 Zurich, Switzerland

[2] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

[3] Univ Durham, Inst Particle Phys Phenomenol, Dept Phys, Durham DH1 3LE, England

[4] Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2007年 / 12期

关键词：

QCD; jets; NLO computations; LEP HERA and SLC physics;

D O I：

10.1088/1126-6708/2007/12/094

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We compute the next-to-next-to-leading order (NNLO) QCD corrections to the six most important event shape variables related to three-particle final states in electron-positron annihilation. The corrections are sizeable for all variables, however their magnitude is substantially different for different observables. We observe that the NNLO corrections yield a considerably better agreement between theory and experimental data both in shape and normalisation of the event shape distributions. The renormalisation scale dependence of the theoretical prediction is substantially reduced compared to the previously existing NLO results. Our results will allow a precise determination of the strong coupling constant from event shape data collected at LEP.

引用

页数：32

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