Measuring the Polarization of Boosted Hadronic Tops

TL;DR

This paper introduces a novel subjet-based method for measuring the polarization of boosted hadronic top quarks that is robust, does not require b-tagging or W-reconstruction, and applies across various new physics scenarios.

Contribution

A new technique for top quark polarization measurement using subjets that is independent of b-tagging, W-reconstruction, and assumptions about production mechanisms.

Findings

The method works across different Monte Carlo generators.

It is effective without relying on b-tagging or W-reconstruction.

The technique is robust for various new physics scenarios.

Abstract

We propose a new technique for measuring the polarization of hadronically decaying boosted top quarks. In particular, we apply a subjet-based technique to events where the decay products of the top are clustered within a single jet. The technique requires neither b-tagging nor W-reconstruction, and does not rely on assumptions about either the top production mechanism or the sources of missing energy in the event. We include results for various new physics scenarios made with different Monte Carlo generators to demonstrate the robustness of the technique.