Heavy Flavor Jet Substructure at Lepton Colliders

TL;DR

This paper analyzes heavy-flavor jet substructure at lepton colliders using advanced QCD techniques, focusing on the dead-cone effect and comparing analytical results with Monte Carlo simulations.

Contribution

It provides a next-to-leading logarithmic analysis of heavy-flavor jet observables, incorporating fixed-order corrections and comparing with multiple Monte Carlo models.

Findings

Successful description of the dead-cone effect in jet substructure

Enhanced understanding of QCD radiation suppression around heavy quarks

Good agreement between analytical calculations and Monte Carlo predictions

Abstract

We provide a detailed analysis of event-shape observables, namely the energy correlation function and jet angularity, for heavy-flavor jets produced in electron-positron collisions, focusing on quantum chromodynamics (QCD) interactions. Using modern jet substructure techniques, we investigate the dead-cone effect, where QCD radiation is suppressed around a heavy quark within an angle proportional to its mass. Our analysis achieves next-to-leading logarithmic accuracy, combined with fixed-order contributions, to improve the description of the transition near the dead-cone threshold. To ensure a comprehensive perspective, we compare our analytical results with predictions from the Pythia, Herwig and Sherpa Monte Carlo simulations at past and future lepton colliders.