Threshold resummed and approximate next-to-next-to-leading order results for W+W- pair production at the LHC

被引:29
作者
Dawson, S. [1 ]
Lewis, Ian M. [1 ]
Zeng, Mao [2 ]
机构
[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[2] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA
基金
美国国家科学基金会;
关键词
JET CROSS-SECTIONS; HELICITY AMPLITUDES; SOFT GLUONS; FACTORIZATION; QCD; PREDICTIONS;
D O I
10.1103/PhysRevD.88.054028
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The next-to-leading order (NLO) QCD radiative corrections to W+W- production at hadron colliders are well understood. We combine NLO perturbative QCD calculations with soft-gluon resummation of threshold logarithms to find a next-to-next-to-leading logarithmic (NNLL) prediction for the total cross section and the invariant mass distribution at the LHC. We also obtain approximate next-to-next-to-leading order (NNLO) results for the total W+W- cross section at the LHC which includes all contributions from the scale dependent leading singular terms. Our result for the approximate NNLO total cross section is the most precise theoretical prediction available. Uncertainties due to scale variation are shown to be small when the threshold logarithms are included. NNLL threshold resummation increases the W+W- invariant mass distribution by similar to 3%-4% in the peak region for both root S = 8 and 14 TeV. The NNLL threshold resummed and approximate NNLO cross sections increase the NLO cross section by 0.5%-3% for root S = 7, 8, 13, and 14 TeV.
引用
收藏
页数:14
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