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We study effects of the scale invariant hidden sector, unparticle, proposedby Georgi, on top spin correlation at the Large Hadron Collider. Assuming noflavor changing interaction between the unparticles and the Standard Modelparticles, there arises the top-antitop quark pair production process throughvirtual unparticle exchanges in the s-channel in addition to the Standard Modelprocesses. In particular, we consider contributions of scalar and vectorunparticles and find that these make sizable deviations of the top spincorrelation from the Standard Model one.

Effects of unparticle on top spin correlation at the Large Hadron Collider