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

TL;DR

This paper investigates how unparticles, a hypothetical scale-invariant sector, could significantly alter top quark spin correlations at the LHC, providing potential signals of new physics beyond the Standard Model.

Contribution

It introduces the effects of scalar and vector unparticles on top spin correlation, highlighting their sizable deviations from Standard Model predictions at the LHC.

Findings

Scalar and vector unparticles cause measurable deviations in top spin correlation.

Unparticle effects could be detectable through top pair production at the LHC.

The study constrains unparticle contributions based on top spin observables.

Abstract

We study effects of the scale invariant hidden sector, unparticle, proposed by Georgi, on top spin correlation at the Large Hadron Collider. Assuming no flavor changing interaction between the unparticles and the Standard Model particles, there arises the top-antitop quark pair production process through virtual unparticle exchanges in the s-channel in addition to the Standard Model processes. In particular, we consider contributions of scalar and vector unparticles and find that these make sizable deviations of the top spin correlation from the Standard Model one.