Isolated photon production in association with a jet pair through next-to-next-to-leading order in QCD
Isolated photon production in association with a jet pair through next-to-next-to-leading order in QCD
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DOI：
10.1007/jhep10(2023)071
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发表时间：
2023-04
影响因子：
5.4
通讯作者：
S. Badger;M. Czakon;H. Hartanto;Ryan Moodie;T. Peraro;R. Poncelet;S. Zoia
中科院分区：
文献类型：
--
作者：
S. Badger;M. Czakon;H. Hartanto;Ryan Moodie;T. Peraro;R. Poncelet;S. Zoia
在这项工作中，我们提供了一套全面的微分截面分布，用于光子+双射流在质子-质子碰撞中产生，在无质量QCD中具有次至次至领先的阶精度。事件选择与ATLAS协作最近的测量结果相对应。我们观察到，与低阶计算相比，在可观测值的情况下，数据的描述得到了改进，而这些可观测值预计会被摄动理论很好地描述。结果还显示，与使用S herpa蒙特卡洛为ATLAS分析生成的parton-shower匹配和多射流合并预测相比，与数据的一致性更好。我们研究的一个特别亮点是精确的五点双环虚拟振幅的使用。这是第一次在QCD中计算出一个完整的2到3个强子对撞机过程，在第二到第二的顺序上，不依赖于两个环的先导色近似。然而，我们证明，鉴于剩余的尺度不确定性，在红外和紫外有限双虚贡献中存在的次先导色效应可以忽略不计。
In this work, we provide a comprehensive set of differential cross-section distributions for photon+ di-jet production in proton-proton collisions with next-to-next-to-leading order precision in massless QCD. The event selection corresponds to recent measurements by the ATLAS collaboration. We observe an improved description of data in comparison to lower-order calculations in the case of observables that are expected to be well described by perturbation theory. The results also show better agreement with data than parton-shower-matched and multi-jet-merged predictions generated for the ATLAS analysis using the S herpa Monte Carlo. A particular highlight of our study is the use of exact five-point two-loop virtual amplitudes. This is the first calculation of a complete two-to-three hadron-collider process at next-to-next-to-leading order in QCD that does not rely on the leading-colour approximation at two loops. We demonstrate, nevertheless, that the sub-leading-colour effects present in the infraredand ultraviolet-finite double-virtual contributions are negligible in view of the remaining scale uncertainties.