arXiv 0907.19842009-07hep-ph

强子对撞机上W+3喷流分布的次领先级QCD预测

Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders

C. F. Berger, Z. Bern, L. J. Dixon, F. Febres Cordero, D. Forde, T. Gleisberg, H. Ita, D. A. Kosower, D. Maitre

备注：: 64 pages, 37 figures, v2 minor changes in table X, cross sections and distributions unaffected; other minor corrections to text, references added
发表信息：: Phys.Rev.D80:074036,2009
DOI：: 10.1103/PhysRevD.80.074036

摘要：

我们提出了次领先阶QCD预测的各种分布在W+3喷流生产在Tevatron和大型强子对撞机。我们包括所有的子过程，并将W玻色子衰变为轻子。我们的结果是在良好的协议与现有的Tevatron数据，并提供了第一个定量精确的次领先的顺序预测的大型强子对撞机。我们将所有项都包括在颜色数量的扩展中，确认我们先前研究中使用的特定主导色近似值精确到3%以内。的截面的依赖重整化和因式分解尺度显着减少相对于一个领先的顺序计算。我们研究了不同的动力学尺度的选择，发现总横能量是显着优于以前的唯象研究中使用的选择。我们计算的一个循环矩阵元素使用壳方法，数值实现的BlackHat代码。计算的其余部分，包括真实排放贡献的生成和相空间上的积分，由SHERPA软件包处理。

英文摘要：

We present next-to-leading order QCD predictions for a variety of distributions in W+3-jet production at both the Tevatron and the Large Hadron Collider. We include all subprocesses and incorporate the decay of the W boson into leptons. Our results are in excellent agreement with existing Tevatron data and provide the first quantitatively precise next-to-leading order predictions for the LHC. We include all terms in an expansion in the number of colors, confirming that the specific leading-color approximation used in our previous study is accurate to within three percent. The dependence of the cross section on renormalization and factorization scales is reduced significantly with respect to a leading-order calculation. We study different dynamical scale choices, and find that the total transverse energy is significantly better than choices used in previous phenomenological studies. We compute the one-loop matrix elements using on-shell methods, as numerically implemented in the BlackHat code. The remaining parts of the calculation, including generation of the real-emission contributions and integration over phase space, are handled by the SHERPA package.

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英文摘要：

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