攻击NLO愿望清单：pp -> tt bb
Assault on the NLO Wishlist: pp -> tt bb
摘要：
我们提出了一个次领先级计算的QCD修正与两个味b-喷注的壳顶-反顶夸克对的生产的结果。除了研究总截面及其尺度依赖性外，我们还给出了几种微分分布。在可比的情况下，我们的结果与以前的分析一致。虽然正在审查的过程是在大型强子对撞机的希格斯玻色子玻色子搜索的主要相关性，我们用它来证明我们的系统建立在Helac-Phegas解决完整的计算在当前的研究前沿的大型强子对撞机的能力。在技术方面，我们展示了如何有效地计算与Helac-1 Loop的虚拟校正，基于重新加权和蒙特卡罗的颜色配置和偏振的方法和减少代码CutTools。至于真正的修正，我们使用最近出版的Helac-Dipoles软件包。在后者的改进方面，我们给出了最后一个缺失的集成偶极子公式所需的一个完整的实施相空间的限制依赖的大规模偶极子减法形式主义。
英文摘要：
We present the results of a next-to-leading order calculation of QCD corrections to the production of an on-shell top-anti-top quark pair in association with two flavored b-jets. Besides studying the total cross section and its scale dependence, we give several differential distributions. Where comparable, our results agree with a previous analysis. While the process under scrutiny is of major relevance for Higgs boson searches at the LHC, we use it to demonstrate the ability of our system built around Helac-Phegas to tackle complete calculations at the frontier of current studies for the LHC. On the technical side, we show how the virtual corrections are efficiently computed with Helac-1Loop, based on the OPP method and the reduction code CutTools, using reweighting and Monte Carlo over color configurations and polarizations. As far as the real corrections are concerned, we use the recently published Helac-Dipoles package. In connection with improvements of the latter, we give the last missing integrated dipole formulae necessary for a complete implementation of phase space restriction dependence in the massive dipole subtraction formalism.
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