We investigate the anomalous $$W^-W^+\gamma /Z$$
W
-
W
+
γ
/
Z
couplings in $$e^-e^+\rightarrow W^-W^+$$
e
-
e
+
→
W
-
W
+
followed by semileptonic decay using a complete set of polarization and spin correlation observables of W boson with the longitudinally polarized beam. We consider a complete set of dimension-six operators affecting $$W^-W^+\gamma /Z$$
W
-
W
+
γ
/
Z
vertex, which are $$SU(2)\times U(1)$$
S
U
(
2
)
×
U
(
1
)
gauge invariant. Some of the polarization and spin correlation asymmetries average out if the daughter of $$W^+$$
W
+
is not tagged and to overcome this we developed an artificial neural network and boosted decision trees to distinguish down-type jets from up-type jets. We obtain bounds on the anomalous couplings using MCMC analysis at $$\sqrt{s} = 250$$
s
=
250
GeV with integrated luminosities of $$\mathcal {L}\in \{100~\text {fb}^{-1}, 250~\text {fb}^{-1}, 1000~\text {fb}^{-1}, 3000~\text {fb}^{-1}\}$$
L
∈
{
100
fb
-
1
,
250
fb
-
1
,
1000
fb
-
1
,
3000
fb
-
1
}
and different sets of systematic errors. We find that using spin-related observables along with cross section in the presence of initial beam polarization significantly improves the bounds on anomalous couplings compared to previous studies.