论文标题
改进了电动玻色子的强烈耦合测定，n $^3 $ lo精度
Improved strong coupling determinations from hadronic decays of electroweak bosons at N$^3$LO accuracy
论文作者
论文摘要
We present two new extractions of the QCD coupling constant at the Z pole, $α_S(m_Z)$, from detailed comparisons of inclusive W and Z hadronic decays data to state-of-the-art perturbative Quantum Chromodynamics calculations at next-to-next-to-next-to-leading order (N$^{3}$LO) accuracy, incorporating the latest experimental and theoretical developments.在W Boson情况下，在提取中首次使用以N $^{3} $ LO计算的总宽度。对于Z Boson伪观察物，N $^{3} $ LO结果与最近可用的完整的两层三环电动校正校正相辅相成，并更新了实验值以说明新估计的LEP亮度偏见。 Z玻色子数据的合并重新分析得出$α_s（M_z）= 0.1203 \ pm 0.0028 $，与先前的最新时间相比，2.3 \％的不确定性降低了约7％。从合并的W玻色子数据中，提取了$α_s（M_z）= 0.101 \ pm 0.027 $的值，其实验不确定性仍然很大，但与以前的工作相比也降低了。在QCD耦合确定的背景下，与persil不确定性的QCD耦合确定所需的理论和参数精度级别进行了详细讨论。
We present two new extractions of the QCD coupling constant at the Z pole, $α_S(m_Z)$, from detailed comparisons of inclusive W and Z hadronic decays data to state-of-the-art perturbative Quantum Chromodynamics calculations at next-to-next-to-next-to-leading order (N$^{3}$LO) accuracy, incorporating the latest experimental and theoretical developments. In the W boson case, the total width computed at N$^{3}$LO is used for the first time in the extraction. For the Z boson pseudo-observables, the N$^{3}$LO results are complemented with the full two- and partial three-loop electroweak corrections recently made available, and the experimental values are updated to account for newly estimated LEP luminosity biases. A combined reanalysis of the Z boson data yields $α_S(m_Z) = 0.1203 \pm 0.0028$, with a 2.3\% uncertainty reduced by about 7\% compared to the previous state-of-the-art. From the combined W boson data, a value of $α_S(m_Z) = 0.101 \pm 0.027$ is extracted, with still large experimental uncertainties but also reduced compared to previous works. The levels of theoretical and parametric precision required in the context of QCD coupling determinations with permil uncertainties from high-statistics W and Z boson samples expected at future $e^+e^-$ colliders such as the FCC-ee, are discussed in detail.
