arXiv 1605.034192016-05-11hep-phhep-ex

在LHC上对$pp \to W^+W^-\to$ 4轻子的次首阶电弱修正

Next-to-leading-order electroweak corrections to $pp \to W^+W^-\to$ 4 leptons at the LHC

Benedikt Biedermann, Marina Billoni, Ansgar Denner, Stefan Dittmaier, Lars Hofer, Barbara Jager, Lukas Salfelder

备注：: 28 pages, 18 eps-figures
DOI：: 10.1007/JHEP06(2016)065

摘要：

我们提出的第一次计算的次到领先的顺序电弱修正的W玻色子对生产的LHC，充分考虑轻子W玻色子衰变和离壳效应。采用现实的事件选择，我们讨论的情况下，是典型的W-玻色子对作为一个信号过程或希格斯玻色子衰变$H\to W W^*$，其中W-玻色子对生产代表一个不可约的背景研究的校正。特别是，我们比较完整的离壳结果，获得治疗的W-玻色子共振在复杂的质量计划，以前的结果在所谓的双极近似，这是基于一个扩展的环路振幅约W共振极点。在小尺度和中等尺度上，特别是在角分布和快度分布上，这两种方法在百分之几的水平上显示出预期的一致性，但在TeV范围内出现了较大的差异。对于横动量分布，差异甚至可以超过10%的水平，在TeV范围内，“背景图”与一个而不是两个共振W玻色子增益的重要性，因为反冲效应。

英文摘要：

We present results of the first calculation of next-to-leading-order electroweak corrections to W-boson pair production at the LHC that fully takes into account leptonic W-boson decays and off-shell effects. Employing realistic event selections, we discuss the corrections in situations that are typical for the study of W-boson pairs as a signal process or of Higgs-boson decays $H\to W W^*$, to which W-boson pair production represents an irreducible background. In particular, we compare the full off-shell results, obtained treating the W-boson resonances in the complex-mass scheme, to previous results in the so-called double-pole approximation, which is based on an expansion of the loop amplitudes about the W resonance poles. At small and intermediate scales, i.e. in particular in angular and rapidity distributions, the two approaches show the expected agreement at the level of fractions of a percent, but larger differences appear in the TeV range. For transverse-momentum distributions, the differences can even exceed the 10% level in the TeV range where "background diagrams" with one instead of two resonant W bosons gain in importance because of recoil effects.

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