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首页> 外文期刊>Journal of High Energy Physics >NLO QCD corrections to {text{t}}overline {text{t}} {text{b}}overline {text{b}} production at the LHC: 2. Full hadronic results
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NLO QCD corrections to {text{t}}overline {text{t}} {text{b}}overline {text{b}} production at the LHC: 2. Full hadronic results

机译：LHC在LHC上对{text {t}}上划线{text {t}} {text {b}}上划线{text {b}}生产进行了NLO QCD更正：2.完整的强子结果

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摘要

We present predictions for ( {text{t}}overline {text{t}} {text{b}}overline {text{b}} ) production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated ( {text{t}}overline {text{t}} {text{H}} ) production in the ( {text{H}} to {text{b}}overline {text{b}} ) decay channel and to directly measure the top-quark Yukawa coupling at the LHC. The leading-order cross section is extremely sensitive to scale variations. We observe that the traditional scale choice adopted in ATLAS simulations underestimates the ( {text{t}}overline {text{t}} {text{b}}overline {text{b}} ) background by a factor two and introduce a new dynamical scale that stabilizes the perturbative predictions. We study various kinematic distributions and observe that the corrections have little impact on their shapes if standard cuts are applied. In the regime of highly boosted Higgs bosons, which offers better perspectives to observe the ( {text{t}}overline {text{t}} {text{H}} ) signal, we find significant distortions of the kinematic distributions. The one-loop amplitudes are computed using process-independent algebraic manipulations of Feynman diagrams and numerical tensor reduction. We find that this approach provides very high numerical stability and CPU efficiency.
机译：我们为LHC以次领先的顺序QCD提出了（{text {t}} overline {text {t}} {text {b}} overline {text {b}}）产量的预测。对此背景过程的精确描述是观察（{text {H}}到{text {b}}中的相关{{text {t}}上划线{text {t}} {text {H}}的前提} overline {text {b}}）衰减通道并直接测量LHC的顶夸克汤河耦合。前导横截面对比例变化非常敏感。我们注意到，ATLAS模拟中采用的传统比例尺选择低估了{{text {t}} overline {text {t}} {text {b}} overline {text {b}}）背景，并引入了一个新的动态尺度，使摄动预测稳定。我们研究了各种运动学分布，并观察到，如果应用标准切割，则校正对其形状的影响很小。在希格斯玻色子高度增强的状态下，它提供了更好的视角来观察（{text {t}} overline {text {t}} {text {H}}信号，我们发现运动分布存在明显的失真。使用费恩图的与过程无关的代数运算和张量数值减少来计算单环幅度。我们发现这种方法提供了很高的数值稳定性和CPU效率。

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  • 来源
    《Journal of High Energy Physics》 |2010年第3期|1-43|共43页
  • 作者

    A. Bredenstein; A. Denner; S. Dittmaier; S. Pozzorini;

  • 作者单位

    1.Theory Center High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan;

    2.Laboratory for Particle Physics Paul Scherrer Institut Würenlingen und Villigen CH-5232 Villigen PSI Switzerland;

    3.Physikalisches Institut Albert-Ludwigs-Universität Freiburg Hermann-Herder-Str. 3 D-79104 Freiburg Germany;

    4.CERN Theory Division CERN Case CO1600 CH-1211 Geneva 23 Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    NLO Computations; Higgs Physics; Hadronic Colliders;

    机译：NLO计算;希格斯物理学;强子对撞机;

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