标题： 通过$W$粒子自旋在$e^+e^-$对撞机上的最优灵敏度异常带电三重规范耦合 显示英文标题

标题： Optimal Sensitivity of Anomalous Charged Triple Gauge Couplings through $W$ boson helicity at the $e^+e^-$ colliders

摘要： 我们通过$WW$产生并随后在$e^+e^-$对撞机上进行半轻子衰变，研究在模型无关的标准模型有效场理论（SMEFT）框架下异常带电三规范玻色子耦合（cTGCs）参数的估计。 异常的$(WWV~(V=\gamma,Z))$耦合在 HISZ 基底下以三个 CP 不变和两个 CP 违反的六维算符的威尔逊系数表示。 我们采用最优可观测量技术（OOT）来提取这些异常耦合的敏感性，并将其与在大型强子对撞机（LHC）上研究的最新实验限制进行比较。 通过 OOT 获得的异常耦合限制比使用标准$\chi^2$分析获得的限制要严格得多。 分析了不同自旋组合的$W$玻色子对在确定最优敏感性中的影响。 还讨论了来自电子电偶极矩（EDM）的 CP 违反算符的约束。 显示英文摘要

摘要： We study the estimation of anomalous charged triple gauge couplings (cTGCs) parameterized in a model-independent Standard Model effective field theory (SMEFT) framework via $WW$ production followed by semi-leptonic decay at the $e^+e^-$ colliders. The anomalous $(WWV~(V=\gamma,Z))$ couplings are given in terms of Wilson coefficients of three CP-conserving and two CP-violating dimension-6 operators in the HISZ basis. We adopt the optimal observable technique (OOT) to extract the sensitivity of these anomalous couplings and compare it with the latest experimental limits on anomalous couplings studied at the LHC. The limits on the anomalous couplings obtained via OOT are significantly tighter than the ones obtained using standard $\chi^2$ analysis. The impact of different helicity combinations of the $W$ boson pair in determining optimal sensitivity is analyzed. The constraints on CP-violating operators from the electron electric dipole moment (EDM) are also discussed.