This research estimates anomalous charged triple gauge couplings using optimal observable techniques, indicating tighter constraints than previous studies.
A bstract 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 part of cTGCs, WWV ( V = γ , Z ), 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 combinations of the helicity of W boson pair in determining the optimal sensitivity is analyzed. The constraints on CP-violating operators from the electron electric dipole moment (EDM) are also discussed.
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Jahedi et al. (2025) studied this question.
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