Safe Use of Jet Pull
Andrew Larkoski, Simone Marzani, and Chang Wu

TL;DR
This paper introduces IRC safe projections of the jet pull vector, enabling better sensitivity to colour flow in Higgs decays while maintaining calculability, and compares theoretical predictions with simulations.
Contribution
It proposes IRC safe versions of the jet pull angle, providing a new tool for studying colour flow in particle physics analyses.
Findings
IRC safe pull angle distributions calculated to next-to-leading logarithmic accuracy.
Comparison shows good agreement between calculations and Monte Carlo simulations.
Asymmetry distributions can help assess subleading colour correlations in parton showers.
Abstract
Jet pull is an observable designed to probe colour flow between jets. Thus far, a particular projection of the pull vector, the pull angle, has been employed to distinguish colour flow between jets produced by a colour singlet or an octet decay. This is of particular importance in order to separate the decay of a Higgs boson to a pair of bottom quarks from the QCD background. However, the pull angle is not infra-red and collinear (IRC) safe. In this paper we introduce IRC safe projections of the pull vector that exhibit good sensitivity to colour flow, while maintaining calculability. We calculate these distributions to next-to-leading logarithmic accuracy, in the context of the hadronic decay of a Higgs boson, and compare these results to Monte Carlo simulations. This study allows us to define an IRC safe version of the pull angle in terms of asymmetry distributions. Furthermore,…
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