Top Quark Pair Production in Association with a Jet with Next-to-Leading-Order QCD Off-Shell Effects at the Large Hadron Collider

被引：49
|
作者：
Bevilacqua, G. [1 ]
Hartanto, H. B. [2 ]
Kraus, M. [2 ]
Worek, M. [2 ]
机构：
[1] Ist Nazl Fis Nucl, Lab Nazl Frascati, Via E Fermi 40, I-00044 Frascati, Italy
[2] Rhein Westfal TH Aachen, Inst Theoret Teilchenphys & Kosmol, D-52056 Aachen, Germany
来源：
PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 05期
关键词：
MASS;
D O I：
10.1103/PhysRevLett.116.052003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a complete description of top quark pair production in association with a jet in the dilepton channel. Our calculation is accurate to next-to-leading order (NLO) in QCD and includes all nonresonant diagrams, interferences, and off-shell effects of the top quark. Moreover, nonresonant and off-shell effects due to the finite W gauge boson width are taken into account. This calculation constitutes the first fully realistic NLO computation for top quark pair production with a final state jet in hadronic collisions. Numerical results for differential distributions as well as total cross sections are presented for the Large Hadron Collider at 8 TeV. With our inclusive cuts, NLO predictions reduce the unphysical scale dependence by more than a factor of 3 and lower the total rate by about 13% compared to leading-order QCD predictions. In addition, the size of the top quark off-shell effects is estimated to be below 2%.
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页数：5
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