Second-order QCD corrections to event shape distributions in deep inelastic scattering

TL;DR

This paper calculates advanced NNLO QCD corrections to event shape distributions in deep inelastic scattering, improving theoretical predictions and reducing uncertainties when compared with experimental data.

Contribution

It provides the first NNLO QCD corrections for event shape distributions in deep inelastic scattering, enhancing the accuracy of theoretical models.

Findings

Corrections significantly vary between different variables.

NNLO corrections reduce scale uncertainties.

Improved agreement with H1 and ZEUS data.

Abstract

We compute the next-to-next-to-leading order (NNLO) QCD corrections to event shape distributions and their mean values in deep inelastic lepton-nucleon scattering. The magnitude and shape of the corrections varies considerably between different variables. The corrections reduce the renormalization and factorization scale uncertainty of the predictions. Using a dispersive model to describe non-perturbative power corrections, we compare the NNLO QCD predictions with data from the H1 and ZEUS experiments. The newly derived corrections improve the theory description of the distributions and of their mean values.