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Determining the spin of any new particle is critical in identifying the truetheory among various extensions of the Standard Model (SM). The degree of$Z$-boson polarization in any two-body decay process $A\to B Z$ is sensitive tothe spin assignments of two new particles $A$ and $B$. Considering all possiblespin-0, 1/2 and 1 combinations in a renormalizable field theory, we demonstratethat $Z$-boson polarization can indeed play a role of a decisive and universalanalyzer in distinguishing the different spin assignments.

$Z$-boson polarization as a model-discrimination analyzer