Heavy Flavour Jet Substructure

TL;DR

This paper provides a detailed theoretical analysis of heavy-flavour jet substructure observables, exploring their potential to reveal the dead cone effect and comparing predictions with Monte Carlo simulations.

Contribution

It offers all-order resummed predictions at next-to-leading-logarithmic accuracy for heavy-flavour jet observables, incorporating fixed-order matching and Monte Carlo comparisons.

Findings

Resummed predictions capture the dead cone effect.

Observable sensitivity varies with quark mass effects.

Monte Carlo models show differences in non-perturbative contributions.

Abstract

We present a comprehensive study of energy correlation functions and jet angularities for heavy-flavour QCD jets. In particular, we discuss the possibility of using these observables to expose the dead cone effect, i.e. the suppression of collinear QCD radiation around massive quarks, and to investigate the sensitivity of different observable definitions to the presence of quark masses. Our calculations are presented as all-order resummed predictions at next-to-leading-logarithmic accuracy, matched to (partial) fixed-order results to obtain a better description of the transition around the dead cone threshold. We also compare our analytic results with Pythia, Herwig and Sherpa Monte Carlo predictions to estimate the impact of non-perturbative contributions such as hadronisation, underlying events and $B$-hadron decays.