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We study the anomalous $W^-W^+\gamma/Z$ couplings in $e^-e^+\to W^-W^+$followed by semileptonic decay using a complete set of polarization and spincorrelation observables of $W$ boson with the longitudinally polarized beam. Weconsider a complete set of dimension-six operators affecting $W^-W^+\gamma/Z$vertex, which are $SU(2)\times U(1)$ gauge invariant. Some of the polarizationand spin correlation asymmetries average out if the daughter of $W^+$ is nottagged. We developed an artificial neural network and boosted decision trees todistinguish down-type jets from up-type jets. We obtain bounds on the anomalouscouplings for center of mass energy $\sqrt{s} = 250$ GeV with integratedluminosities of~$\mathcal{L}\in\{100~\text{fb}^{-1}, 250~\text{fb}^{-1},1000~\text{fb}^{-1}, 3000~\text{fb}^{-1}\}$. We find that using spin-relatedobservables and cross~section in the presence of initial beam polarizationsignificantly improves the bounds on anomalous couplings compared to previousstudies.

Study of anomalous $W^-W^+\gamma/Z$ couplings using polarizations and spin correlations in $e^-e^+\to W^-W^+$ with polarized beams