NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders

被引：101
作者：
Denner, A. [1 ]
Dittmaier, S. [2 ]
Kallweit, S. [3 ]
Pozzorini, S. [3 ]
机构：
[1] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
[2] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany
[3] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 10期
关键词：
NLO Computations; Hadronic Colliders; HEAVY-QUARK PRODUCTION; PAIR PRODUCTION; RADIATIVE-CORRECTIONS; ELECTROWEAK CORRECTIONS; NUMERICAL EVALUATION; UNSTABLE PARTICLES; CHARGED-CURRENT; DISTRIBUTIONS; REDUCTION; PREDICTIONS;
D O I：
10.1007/JHEP10(2012)110
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 present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for nu(e+)(e)mu(-)(nu) over bar (mu)b (b) over bar production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. However, they can be strongly enhanced in exclusive observables that play an important role in Higgs and new-physics searches. Also non-resonant and off-shell effects due to the finite W-boson width are investigated in detail, but their impact is much smaller than naively expected. We also introduce a matching approach to improve NLO calculations involving intermediate unstable particles. Using a fixed QCD scale leads to perturbative instabilities in the high-energy tails of distributions, but an appropriate dynamical scale stabilises NLO predictions. Numerical results for the total cross section, several distributions, and asymmetries are presented for Tevatron and the LHC at 7TeV, 8TeV, and 14TeV.
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页数：61
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