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arXiv 2302.05403hep-phhep-ex
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强子对撞机上W和Z玻色子产生的QED与QCD横动量重求和结合

Combining QED and QCD transverse-momentum resummation for W and Z boson production at hadron colliders

Andrea Autieri, Leandro Cieri, Giancarlo Ferrera, German F. R. Sborlini

AI总结:

本文结合QED和QCD辐射的横动量重求和,研究了强子对撞机上W和Z玻色子的$q_T$分布,在多阶精度下包含软共线辐射修正,并展示了数值结果与不确定性估计。

摘要:

本文研究了强子碰撞中产生的W和Z玻色子的横动量($q_T$)分布。我们结合了QED和QCD辐射的$q_T$重求和,包括末态W玻色子的QED软辐射。具体而言,我们在QED的次领头阶精度、混合QED-QCD的领头阶精度以及QCD的次次领头阶精度下,对软和共线辐射导致的增强对数贡献进行了重求和。在小$q_T$区域,我们在结果中一致地包含了次次领头阶(即双圈)QCD修正和次领头阶(即单圈)电弱修正。在大$q_T$区域与固定阶计算的重合在QCD的次领头阶(即$\mathcal{O}(α_S^2)$)和QED的领头阶下进行。我们展示了在Tevatron和LHC上W和Z产生的数值结果。最后,我们考虑了QCD和QED联合重求和对W和Z的$q_T$分布比值的影响,并研究了QED修正的影响,给出了相应的微扰不确定性估计。

英文摘要:

In this article, we consider the transverse momentum ($q_T$) distribution of $W$ and $Z$ bosons produced in hadronic collisions. We combine the $q_T$ resummation for QED and QCD radiation including the QED soft emissions from the $W$ boson in the final state. In particular, we perform the resummation of enhanced logarithmic contributions due to soft and collinear emissions at next-to-leading accuracy in QED, leading-order accuracy for mixed QED-QCD and next-to-next-to-leading accuracy in QCD. In the small-$q_T$ region we consistently include in our results the next-to-next-to-leading order (i.e.\ two loops) QCD corrections and the next-to-leading order (i.e.\ one loop) electroweak corrections. The matching with the fixed-order calculation at large $q_T$ has been performed at next-to-leading order in QCD (i.e.\ at $\mathcal{O}(α_S^2)$) and at leading order in QED. We show numerical results for $W$ and $Z$ production at the Tevatron and the LHC. Finally, we consider the effect of combined QCD and QED resummation for the ratio of $W$ and $Z$ $q_T$ distributions, and we study the impact of the QED corrections providing an estimate of the corresponding perturbative uncertainties.

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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