期刊
PHYSICS LETTERS B
卷 710, 期 4-5, 页码 612-622出版社
ELSEVIER
DOI: 10.1016/j.physletb.2012.03.013
关键词
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资金
- French Agence National de la Recherche [ANR-09-BLAN-0060]
- EU ITN [PITN-GA-2010-264564]
- Heisenberg
- Deutsche Forschungsgemeinschaft
- U.S. National Science Foundation [NSF-PHY-0705682]
- LHC Theory Initiative, Jonathan Bagger, PI
- Division Of Physics
- Direct For Mathematical & Physical Scien [705682] Funding Source: National Science Foundation
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.
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