A POWHEG generator for deep inelastic scattering

TL;DR

This paper introduces a new event generator for deep inelastic scattering at NLO in QCD, integrated with parton showers using the POWHEG method, tailored for lepton-hadron collision kinematics.

Contribution

It extends the POWHEG BOX framework with new momentum mappings and subtraction mechanisms specifically for DIS processes, enabling more accurate simulations.

Findings

Predictions agree well with HERA data.

Provides reliable simulations for future Electron Ion Collider experiments.

Enhances the accuracy of DIS event modeling.

Abstract

We present a new event generator for the simulation of both neutral- and charged-current deep inelastic scattering (DIS) at next-to-leading order in QCD matched to parton showers using the POWHEG method. Our implementation builds on the existing POWHEG BOX framework originally designed for hadron-hadron collisions, supplemented by considerable extensions to account for the genuinely different kinematics inherent to lepton-hadron collisions. In particular, we present new momentum mappings that conserve the special kinematics found in DIS, which we use to modify the POWHEG BOX implementation of the Frixione-Kunszt-Signer subtraction mechanism. We compare our predictions to fixed-order and resummed predictions, as well as to data from the HERA ep collider. Finally we study a few representative distributions for the upcoming Electron Ion Collider.