arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.14867hep-ph
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在LHC产生${\bf \text{W}^+\text{W}^-}$中的极化电弱玻色子,包括NLO QCD效应

Polarized electroweak bosons in ${\bf \text{W}^+\text{W}^-}$ production at the LHC including NLO QCD effects

Ansgar Denner, Giovanni Pelliccioli

摘要:

在大型强子对撞机上对大质量规范玻色子极化率的测量为标准模型,特别是电弱对称性破缺机制提供了重要的检验。由于$\text{W}$和$\text{Z}$玻色子的不稳定特性,设计偏振信号的理论定义并不简单,并且总是受到一些模糊性的影响。针对LHC全轻子通道中$\text{W}$ -玻色子对的产生,我们提出了基于规范不变的双共振振幅部分来计算极化截面和分布.我们包括非线性光学量子色动力学修正的领导夸克诱导的部分子过程,也考虑环诱导胶子发起的过程有助于相同的最终状态。我们提出了一个包容性的设置和一个现实的基准区域的结果,特别关注的变量,适合于极化截面的歧视和数量,可以通过实验测量。

英文摘要:

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 $\text{W}$ and $\text{Z}$ bosons, devising a theoretical definition for polarized signals is not straightforward and always subject to some ambiguity. Focusing on $\text{W}$-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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