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We investigate the effects of scalar and vector unparticles on top quark spincorrelations via the process $e^{+}e^{-}\to t \bar{t}$. In addition to theStandard Model diagrams, there is a new contribution to top-antitop quarkproduction process mediated by unparticle in the s-channel. It is shown thatscalar and vector unparticle contribution leads to a considerable deviation ofthe top spin correlations from the Standard Model one.

Unparticle Effects on Top Quark Spin Correlations in e^+e^- Collision