Phenomenology of jet angularities at the LHC

TL;DR

This paper presents advanced theoretical predictions for jet angularities at the LHC, incorporating resummation, non-perturbative effects, and comparisons with CMS data to improve understanding of quark and gluon jets.

Contribution

It introduces a comprehensive approach combining resummed calculations, non-perturbative corrections, and Monte Carlo simulations for jet angularities, validated against experimental data.

Findings

Good agreement between predictions and CMS measurements

Non-perturbative effects significantly impact angularity distributions

Higher-accuracy calculations are needed due to sizeable uncertainties

Abstract

We compute resummed and matched predictions for jet angularities in hadronic dijet and Z+jet events with and without grooming the candidate jets using the SoftDrop technique. Our theoretical predictions also account for non-perturbative corrections from the underlying event and hadronisation through parton-to-hadron level transfer matrices extracted from dedicated Monte Carlo simulations with SHERPA. Thanks to this approach we can account for non-perturbative migration effects in both the angularities and the jet transverse momentum. We compare our predictions against recent measurements from the CMS experiment. This allows us to test the description of quark- and gluon-jet enriched phase-space regions separately. We supplement our study with SHERPA results based on the matching of NLO QCD matrix elements with the parton shower. Both theoretical predictions offer a good description of the data, within the experimental and theoretical uncertainties. The latter are however sizeable, motivating higher-accuracy calculations.