Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation

被引：411
作者：
Cacciari, Matteo [5 ,6 ,7 ]
Czakon, Michal [4 ]
Mangano, Michelangelo [1 ]
Mitov, Alexander [1 ]
Nason, Paolo [1 ,2 ,3 ]
机构：
[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
[2] Univ Milano Bicocca, Ist Nazl Fis Nucl, I-20133 Milan, Italy
[3] Univ Milano Bicocca, Dept Phys, I-20133 Milan, Italy
[4] Rhein Westfal TH Aachen, Inst Theoret Teilchenphys & Kosmol, D-52056 Aachen, Germany
[5] Univ Paris Diderot, Paris, France
[6] Univ Paris 06, LPTHE, F-75252 Paris 05, France
[7] CNRS, UMR 7589, F-75252 Paris 05, France
来源：
PHYSICS LETTERS B | 2012年 / 710卷 / 4-5期
基金：
美国国家科学基金会;
关键词：
HEAVY-QUARK PRODUCTION; QCD CORRECTIONS; CROSS-SECTION; PARTON DISTRIBUTIONS; THRESHOLD EXPANSION; COLLISIONS;
D O I：
10.1016/j.physletb.2012.03.013
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Incorporating all recent theoretical advances, we resum soft-gluon corrections to the total t (t) over bar cross-section at hadron colliders at the next-to-next-to-leading logarithmic (NNLL) order. We perform the resummation in the well established framework of Mellin N-space resummation. We exhaustively study the sources of systematic uncertainty like renormalization and factorization scale variation, power suppressed effects and missing two- and higher-loop corrections. The inclusion of soft-gluon resummation at NNLL brings only a minor decrease in the perturbative uncertainty with respect to the NLL approximation, and a small shift in the central value, consistent with the quoted uncertainties. These numerical predictions agree with the currently available measurements from the Tevatron and LHC and have uncertainty of similar size. We conclude that significant improvements in the t (t) over bar cross-sections can potentially be expected only upon inclusion of the complete NNLO corrections. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：612 / 622
页数：11
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