New physics effects on top quark spin correlation and polarization at the LHC: a comparative study in different models

TL;DR

This paper compares how different new physics models could affect top quark spin correlation and polarization at the LHC, considering current experimental constraints.

Contribution

It provides a comparative analysis of top quark spin effects in three new physics models under existing experimental constraints.

Findings

Polarization asymmetry can be significantly enhanced in all models.

Detectable corrections to spin correlation are possible in axigluon and RPV-MSSM models.

Some models predict effects within the reach of current LHC measurements.

Abstract

Extensions of the Standard Model often predict new chiral interactions for top quark, which will contribute to top quark spin correlation and polarization in $t\bar{t}$ production at the LHC. In this work, under the constraints from the current Tevatron measurements, a comparative study of the spin correlation and polarization is performed in three new physics models: the minimal supersymmetric model without R-parity (RPV-MSSM), the third-generation enhanced left-right model and the axigluon model. We find that the polarization asymmetry may be enhanced to the accessible level in all these models while the correction to the spin correlation may be detectable in the axigluon model and the RPV-MSSM with $\lambda"$ couplings.