Dominant mixed QCD-electroweak $\mathcal{O}(\alpha_s\alpha)$ corrections to Drell-Yan processes in the resonance region
Dominant mixed QCD-electroweak $\mathcal{O}(\alpha_s\alpha)$ corrections to Drell-Yan processes in the resonance region
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DOI：
10.1016/j.nuclphysb.2016.01.006
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
S. Dittmaier;A. Huss;C. Schwinn
中科院分区：
文献类型：
--
作者：
S. Dittmaier;A. Huss;C. Schwinn
在共振区的W-和Z-玻色子生产的精确的理论描述是必要的正确解释的W-玻色子质量和有效弱混合角的高精度测量。目前，最大的未知固定阶贡献是由混合的QCD-电弱修正。我们认为，使用的框架的极展开的NNLO QCD-电弱修正建立在以前的文件中，数值上占主导地位的修正产生的组合的大QCD修正的生产与大的电弱修正的W/Z玻色子的衰变。我们计算了这些所谓的“初始-最终”类型的可因子化修正，并估计了对W玻色子质量提取的影响。我们比较我们的结果更简单的近似组合的电弱和QCD校正的天真产品的NLO QCD和电弱校正因子和使用领先的对数近似QED末态辐射的结构功能方法或QED部分子淋浴程序。我们还计算了“最终最终”类型的修正，这是由轻子矢量玻色子衰变的有限反项给出的，并且被发现在数值上可以忽略不计。
A precise theoretical description of W- and Z-boson production in the resonance region is essential for the correct interpretation of high-precision measurements of the W-boson mass and the effective weak mixing angle. Currently, the largest unknown fixed-order contribution is given by the mixed QCD-electroweak corrections of. We argue, using the framework of the pole expansion for the NNLO QCD-electroweak corrections established in a previous paper, that the numerically dominant corrections arise from the combination of large QCD corrections to the production with the large electroweak corrections to the decay of the W/Z boson. We calculate these so-called factorizable corrections of "initial-final" type and estimate the impact on the W-boson mass extraction. We compare our results to simpler approximate combinations of electroweak and QCD corrections in terms of naive products of NLO QCD and electroweak correction factors and using leading-logarithmic approximations for QED final-state radiation as provided by the structure-function approach or QED parton-shower programs. We also compute corrections of "final-final" type, which are given by finite counterterms to the leptonic vectorboson decays and are found to be numerically negligible.