(N)NLO+NLL' accurate predictions for plain and groomed 1-jettiness in neutral current DIS

TL;DR

This paper provides high-precision theoretical predictions for 1-jettiness distributions in neutral current deep-inelastic scattering, incorporating resummation, matching, grooming techniques, and non-perturbative corrections, with validation against Monte Carlo simulations.

Contribution

It introduces N(N)LO+NLL' accurate predictions for jet observables in DIS, including grooming effects and detailed non-perturbative corrections, enhancing the precision of QCD analyses.

Findings

Soft-drop grooming reduces non-perturbative effects.

Good agreement between resummed calculations and Sherpa simulations.

Hadronisation corrections are significant without grooming.

Abstract

The possibility to reanalyse data taken by the HERA experiments offers the chance to study modern QCD jet and event-shape observables in deep-inelastic scattering. To address this, we compute resummed and matched predictions for the 1-jettiness distribution in neutral current DIS with and without grooming the hadronic final state using the soft-drop technique. Our theoretical predictions also account for non-perturbative corrections from hadronisation through parton-to-hadron level transfer matrices extracted from dedicated Monte Carlo simulations with Sherpa. To estimate parameter uncertainties in particular for the beam-fragmentation modelling we derive a family of replica tunes to data from the HERA experiments. While NNLO QCD normalisation corrections to the NLO+NLL' prediction are numerically small, hadronisation corrections turn out to be quite sizeable. However, soft-drop grooming significantly reduces the impact of non-perturbative contributions. We supplement our study with hadron-level predictions from Sherpa based on the matching of NLO QCD matrix elements with the parton shower. Good agreement between the predictions from the two calculational methods is observed.