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arXiv 1006.2653hep-ph
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在NLO QCD的LHC生产t抗t b抗b

Production of t anti-t b anti-b at the LHC at NLO QCD

Axel Bredenstein, Ansgar Denner, Stefan Dittmaier, Stefano Pozzorini

摘要:

我们总结了预测的顶部反顶底反底(tTbB)生产在大型强子对撞机在次领先的QCD。对这一背景过程的精确描述是在H ->底反底衰变通道中观测关联顶反顶Higgs产生的前提。使用费曼图和数值张量约化计算单圈振幅。这种方法提供了非常高的数值稳定性和CPU效率。我们发现,在ATLAS模拟中采用的尺度选择低估了tTbB背景的一个因素,并引入了一个新的动力学尺度,稳定的扰动预测。在高度提升的希格斯玻色子玻色子的制度,这提供了更好的视角来观察tTH(H-> bB)信号,校正引起显着的扭曲的运动学分布。

英文摘要:

We summarise predictions for top anti-top bottom anti-bottom (tTbB) production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated top anti-top Higgs production in the H -> bottom anti-bottom decay channel. The one-loop amplitudes are computed using Feynman diagrams and numerical tensor reduction. This approach provides very high numerical stability and CPU efficiency. We find that the scale choice adopted in ATLAS simulations underestimates the tTbB background by a factor two and introduce a new dynamical scale that stabilises the perturbative predictions. In the regime of highly boosted Higgs bosons, which offers better perspectives to observe the tTH(H-> bB) signal, the corrections induce significant distortions in the kinematic distributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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