NLO QCD corrections to pp/p(p)over-bar → WW plus jet plus X including leptonic W-boson decays

被引：40
|
作者：
Dittmaier, S. [3 ,4 ]
Kallweit, S. [1 ,4 ]
Uwer, P. [2 ]
机构：
[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[2] Humboldt Univ, Inst Phys, D-10099 Berlin, Germany
[3] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany
[4] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
来源：
NUCLEAR PHYSICS B | 2010年 / 826卷 / 1-2期
关键词：
LOOP; GENERATION; REDUCTION; ALGORITHM; DIAGRAMS; QUARKS;
D O I：
10.1016/j.nuclphysb.2009.09.029
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 report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at the Tevatron and the LHC, which is an important source of background for Higgs and new-physics searches. Leptonic decays of the W bosons are included by applying an improved version of the narrow-width approximation that treats the W bosons as on-shell particles, but keeps the information on the W spin. Contributions from external bottom quarks are neglected, because they are either numerically suppressed or should be attributed to different processes such as Wt or t (t) over bar production. A survey of differential NLO QCD cross sections is provided both for the LHC and the Tevatron. The QCD corrections stabilize the leading-order prediction for the cross section with respect to scale variations. However, the scale dependence of the next-to-leading order results for the LHC is only reduced considerably if a veto against the emission of a second hard jet is applied. In general, the corrections do not simply rescale the differential leading-order cross sections. In particular, their shapes are distorted if an additional energy scale is involved. (C) 2009 Elsevier B.V. All rights reserved.
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页码：18 / 70
页数：53
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