Jet angularities in photoproduction at the Electron-Ion Collider

TL;DR

This paper analyzes jet angularities in photoproduction events at the Electron-Ion Collider using perturbative QCD calculations and compares results with Monte Carlo simulations, demonstrating feasibility and potential applications in jet physics.

Contribution

It provides the first detailed study of jet angularities at the EIC, including theoretical calculations, Monte Carlo validation, and detector requirements for future measurements.

Findings

Good agreement between NLL calculations and PYTHIA predictions.

Jet substructure observables are feasible at the EIC despite low energies.

Insights into detector specifications for angularity measurements.

Abstract

We consider the one-parameter family of jet substructure observables known as angularities using the specific case of inclusive jets arising from photoproduction events at an Electron-Ion Collider (EIC). We perform numerical calculations at next-to-leading logarithmic accuracy within perturbative QCD and compare our results to PYTHIA 6 predictions. Overall, we find good agreement and conclude that jet substructure observables are feasible at the EIC despite the relatively low jet transverse momentum and particle multiplicities. We investigate the size of subleading power corrections relevant at low energies within the Monte Carlo setup. In order to establish the validity of the Monte Carlo tune, we also perform comparisons to jet shape data at HERA. We further discuss detector requirements necessary for angularity measurements at an EIC, focusing on hadron calorimeter energy and spatial resolutions. Possible applications of precision jet substructure measurements at the EIC include the tuning of Monte Carlo event generators, the extraction of nonperturbative parameters and studies of cold nuclear matter effects.