New physics in ttbar spin correlations at the Tevatron

TL;DR

This paper proposes a method to measure the top quark's chromomagnetic moment using angular distributions from ttbar spin correlations, achieving high precision and robustness against experimental uncertainties.

Contribution

It introduces a new approach to determine the top chromomagnetic moment through angular distributions, emphasizing the inclusion of all-hadronic events for improved accuracy.

Findings

Potential to measure the top chromomagnetic moment with ~0.1 accuracy.

Method is robust against background and reconstruction uncertainties.

Including all-hadronic events enhances measurement precision.

Abstract

We show that the angular distributions of leptons or jets due to ttbar spin correlations allow a determination of the top chromomagnetic moment kappa with an accuracy of order 0.1. The method is quite insensitive to background, event reconstruction, and other experimental uncertainties. The total event number is important, so we suggest the inclusion of all-hadronic events.