The measurement of polarization fractions of massive gauge bosons at the LHC provides an important check of the Standard Model and in particular of the Electroweak Symmetry Breaking mechanism. Owing to the unstable character of W and Z bosons, devising a theoretical definition for polarized signals is not straightforward and always subject to some ambiguity. Focusing on W-boson pair production at the LHC in the fully leptonic channel, we propose to compute polarized cross-sections and distributions based on the gauge-invariant doubly-resonant part of the amplitude. We include NLO QCD corrections to the leading quark-induced partonic process and also consider the loop- induced gluon-initiated process contributing to the same final state. We present results for both an inclusive setup and a realistic fiducial region, with special focus on variables that are suited for the discrimination of polarized cross-sections and on quantities that can be measured experimentally.

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LHC 产生 W+W− 的极化电弱玻色子，包括 NLO QCD 效应

在 LHC 上测量大质量规范玻色子的极化分数提供了对标准模型的重要检查，特别是对电弱对称破坏机制的检查。由于 W 和 Z 玻色子的不稳定特性，为极化信号设计一个理论定义并不简单，而且总是存在一些歧义。专注于 LHC 在全轻子通道中的 W 玻色子对产生，我们建议根据振幅的规范不变双共振部分计算极化截面和分布。我们将 NLO QCD 校正包括到领先的夸克诱导的部分子过程中，并考虑了对相同最终状态有贡献的环诱导的胶子启动过程。我们展示了包容性设置和现实基准区域的结果，