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arXiv 2411.13664hep-ph
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在$e^+e^-$对撞机上通过$W$玻色子螺旋度获得反常荷电三重规范耦合的最优灵敏度

Optimal sensitivity of anomalous charged triple gauge couplings through $W$ boson helicity at the $e^+e^-$ colliders

Sahabub Jahedi, Jayita Lahiri, Amir Subba

AI总结:

本研究在SMEFT框架下,利用OOT通过$e^+e^-$对撞机上$WW$半轻衰变过程提取反常cTGCs的灵敏度,分析了W玻色子螺旋度的影响,得到比LHC实验和标准$χ^2$分析更严格的限制,并讨论了电子EDM的约束。

摘要:

我们在模型无关的标准模型有效场论(SMEFT)框架下,研究了通过$e^+e^-$对撞机上的$WW$产生及随后的半轻衰变,对以该框架参数化的反常荷电三重规范耦合(cTGCs)的估计。反常$(WWV~(V=γ,Z))$耦合由HISZ基中3个CP守恒和2个CP破坏的6维算符的Wilson系数给出。我们采用最优可观测量技术(OOT)提取这些反常耦合的灵敏度,并将其与大型强子对撞机(LHC)上研究的反常耦合的最新实验限制进行比较。通过OOT得到的反常耦合限制比使用标准$χ^2$分析得到的限制严格得多。我们分析了$W$玻色子对的不同螺旋度组合对确定最优灵敏度的影响。此外还讨论了电子电偶极矩(EDM)对CP破坏算符的约束。

英文摘要:

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 $(WWV~(V=γ,Z))$ 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 $χ^2$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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