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arXiv 2203.01565hep-phhep-ex
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LHC 上 Drell-Yan 过程的三阶 fiducial 预测

Third order fiducial predictions for Drell-Yan at the LHC

X. Chen, T. Gehrmann, E. W. N. Glover, A. Huss, P. Monni, E. Re, L. Rottoli, P. Torrielli

备注：
7 pages, 3 figures, 1 Table + suppl. material. Minor modifications and updated figures. Version published in PRL
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AI总结：

本文针对 LHC 的 Drell-Yan 过程，计算强耦合三阶固定阶并结合全阶重求和的 fiducial 截面与微分分布，分析减除方法、红外敏感性及截断影响，将理论不确定性降至百分位水平。

摘要：

强子对撞机上的 Drell-Yan 过程是研究强相互作用并提取电弱参数的基础基准。LHC 的卓越精度要求理论预测非常准确，并充分计入 fiducial 实验截断。在这篇 letter 中，我们给出了该过程 fiducial 截面和微分分布的最新计算：在强耦合的严格固定阶展开中达到第三阶，同时包含对数修正的全阶重求和。与这些结果一起，我们详细研究了为不同实验截断集合执行计算所采用的减除技术，以及 fiducial 截面对红外物理的敏感性。我们发现，残余理论不确定性被降低到百分位水平，并且通过适当调整 fiducial 截断，可以提高预测的稳健性。

英文摘要：

The Drell-Yan process at hadron colliders is a fundamental benchmark for the study of strong interactions and the extraction of electro-weak parameters. The outstanding precision of the LHC demands very accurate theoretical predictions with a full account of fiducial experimental cuts. In this letter we present a state-of-the-art calculation of the fiducial cross section and of differential distributions for this process at third order in the strict fixed-order expansion in the strong coupling, as well as including the all-order resummation of logarithmic corrections. Together with these results, we present a detailed study of the subtraction technique used to carry out the calculation for different sets of experimental cuts, as well as of the sensitivity of the fiducial cross section to infrared physics. We find that residual theory uncertainties are reduced to the percent level and that the robustness of the predictions can be improved by a suitable adjustment of fiducial cuts.

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