Tagging Partially Reconstructed Objects with Jet Substructure

TL;DR

This paper introduces a novel jet tagger designed to identify partially reconstructed objects, especially in intermediate boost regimes, by analyzing substructure and employing jet grooming techniques.

Contribution

The paper presents a new tagger that effectively identifies partially reconstructed jets, filling a gap where existing methods underperform, especially for intermediate boost scenarios.

Findings

Effective in intermediate boost regimes

Combines substructure analysis with jet grooming

Complementary to existing tagging methods

Abstract

We present a new tagger which aims at identifying partially reconstructed objects, in which only some of the constituents are collected in a single jet. As an example, we focus on top decays in which either part of the hadronically decaying W or the b jet is soft or falls outside of the top jet cone. We construct an observable to identify remnant substructure from the decay and employ aggressive jet grooming to reject QCD backgrounds. The tagger is complementary to existing ones and works well in the intermediate boost regime where jet substructure techniques usually fail. It is anticipated that a similar tagger can be used to identify non-QCD hadronic jets, such as those expected from hidden valleys.