arXiv 1405.68972014-05hep-ph

共振区Drell-Yan过程的O（α_sα）修正

O(α_sα) corrections to Drell-Yan processes in the resonance region

Stefan Dittmaier, Alexander Huss, Christian Schwinn

备注：: 9 pages, latex, postscript figures, contribution to the proceedings of the conference "Loops and Legs in Quantum Field Theory - LL 2014, 27 April - 2 May 2014, Weimar, Germany, discussion of factorizable O(α_sα) corrections extended in version 2

摘要：

在共振区产生类似于Drell-Yan的W玻色子和Z玻色子，这允许进行一些高精度的测量，这些测量对于将标准模型的实验测试推向极端至关重要，例如确定W玻色子质量和有效弱混合角。我们描述了如何标准模型预测可以成功地进行在一个一致的扩展方面的共振极点，分类的可因式分解和不可因式分解的贡献方面的修正。前者可归因于W/Z产生和衰变子过程，而后者通过软光子交换将产生和衰变联系起来。在下一个领导阶，我们比较了充分的电弱修正与极点扩展近似，确认近似的有效性。在O（α_sα）处，我们描述了展开式的概念，并报道了不可因式分解的贡献的结果，这些贡献在唯象上是可以忽略的.此外，我们还首次（初步）给出了由初态QCD和末态电弱修正相互作用引起的O（α sα）主导因子修正的结果.从数值上看，这些修正值与两个次一阶修正因子的乘积有很大的不同。

英文摘要：

Drell-Yan-like W-boson and Z-boson production in the resonance region allows for some high-precision measurements that are crucial to carry experimental tests of the Standard Model to the extremes, such as the determinations of the W-boson mass and the effective weak mixing angle. We describe how the Standard Model prediction can be successfully performed in terms of a consistent expansion about the resonance pole, which classifies the corrections in terms of factorizable and non-factorizable contributions. The former can be attributed to the W/Z production and decay subprocesses individually, while the latter link production and decay by soft-photon exchange. At next-to-leading order we compare the full electroweak corrections with the pole-expanded approximations, confirming the validity of the approximation. At O(α_sα), we describe the concept of the expansion and report on results on the non-factorizable contributions, which turn out to be phenomenologically negligible. Moreover, we present first (preliminary) results on the dominant factorizable O(α_sα) corrections, which originate from the interplay of initial-state QCD and final-state electroweak corrections. Numerically those corrections significantly differ from a mere product of the two next-to-leading-order correction factors.

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英文摘要：

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