在LHC生产的NNLO QCD预测
Paolo Garbarino1, Massimiliano Grazzini1, Stefan Kallweit1
1Physik Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
概括
对于W玻色子的精确理论预测,大强子对撞机的两个光子的产生现在可以在量子染色力学中以次要次要的顺序 (NNLO) 获得. 这些计算使以前的预测得到了23%的改进,改善了电弱部门的研究.
科学领域:
- 粒子物理学 粒子物理学
- 高能物理 高能物理
- 量子色态动力学 量子色态动力学
背景情况:
- Triboson 的生产过程是探测标准模型的电弱部门的关键.
- 在这些过程中,四极体测量玻色子合在树层参与.
- 大强子对撞机 (LHC) 的精度测量需要准确的理论预测.
研究的目的:
- 为了计算下一个到下一个到领先的顺序 (NNLO) 量子染色力学 (QCD) 辐射校正.
- 为LHC提供W玻色子和两个光子生产 (Wγγ) 的理论预测.
- 为了提高电弱板块测量的精度.
主要方法:
- 对Wγγ产量的NNLO QCD辐射校正的计算.
- 精确的计算,在主色近似中使用两个循环贡献的有限部分.
- 在标准实验切割下,预测提供了13TeV的信托横截面和动力分布.
主要成果:
- 发现了可观的NNLO校正,将下一个领先顺序的预测提高了约23%.
- 剩余的扰动性不确定性估计在5%的水平.
- 结果与其他涉及直接光子的多元子过程的观测结果一致.
结论:
- 计算的NNLO校正对于对LHC的电弱板块进行精确研究至关重要.
- 增强的预测提高了我们对基本粒子相互作用的理解.
- 该研究为正在进行和未来的实验分析提供了一个重要的理论基准.
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