Institute for Theoretical Physics, ETH, CH-8093 Zürich, Switzerland.
Department of Physics, University of Zürich, CH-8057 Zürich, Switzerland.
Phys Rev Lett. 2018 Mar 23;120(12):122001. doi: 10.1103/PhysRevLett.120.122001.
The transverse momentum spectra of weak gauge bosons and their ratios probe the underlying dynamics and are crucial in testing our understanding of the standard model. They are an essential ingredient in precision measurements, such as the W boson mass extraction. To fully exploit the potential of the LHC data, we compute the second-order [next-to-next-to-leading-order (NNLO)] QCD corrections to the inclusive-p_{T}^{W} spectrum as well as to the ratios of spectra for W^{-}/W^{+} and Z/W. We find that the inclusion of NNLO QCD corrections considerably improves the theoretical description of the experimental CMS data and results in a substantial reduction of the residual scale uncertainties.
弱规范玻色子的横动量谱及其比值得以探测潜在动力学，并在检验我们对标准模型的理解方面发挥着至关重要的作用。它们是精密测量的重要组成部分，例如 W 玻色子质量的提取。为了充分利用 LHC 数据的潜力，我们计算了包括 W 玻色子横动量谱以及 W^{-}/W^{+}和 Z/W 谱比的二次方 [次领头阶（NNLO）] QCD 修正。我们发现，包含 NNLO QCD 修正可以极大地改善对 CMS 实验数据的理论描述，并导致残余尺度不确定性的显著降低。
