Investigating top tagging with Y$_{\text{m}}$-Splitter and N-subjettiness

TL;DR

This paper provides an analytical QCD study of top-tagging techniques using Y$_{ ext{m}}$-Splitter and N-subjettiness, deriving resummed results to understand their effectiveness in distinguishing signal from background jets.

Contribution

It introduces a combined analytical framework for top-tagging using Y$_{ ext{m}}$-Splitter and N-subjettiness, offering new insights into their roles and performance.

Findings

Resummed results for signal and background jets.

Insights into the role of substructure and radiation constraints.

Impact of pre-grooming on tagging performance.

Abstract

We study top-tagging from an analytical QCD perspective focusing on the role of two key steps therein : a step to find three-pronged substructure and a step that places constraints on radiation. For the former we use a recently introduced modification of Y-Splitter, known as Y$_{\text{m}}$-Splitter, and for the latter we use the well-known N-subjettiness variable. We derive resummed results for this combination of variables for both signal jets and background jets, also including pre-grooming of the jet. Our results give new insight into the performance of top tagging tools in particular with regard to the role of the distinct steps involved.