TWOPEG-D: An Extension of TWOPEG for the Case of a Moving Proton Target

TL;DR

TWOPEG-D is an extended event generator that simulates double-pion electroproduction off a moving proton in deuteron targets, accounting for Fermi motion and effective beam energy variations, validated with CLAS data.

Contribution

This work introduces TWOPEG-D, a novel extension of the TWOPEG generator, to accurately model quasi-free processes involving moving protons in deuteron targets.

Findings

Successfully simulated deuteron target data

Validated against CLAS experimental results

Demonstrated effective modeling of Fermi motion effects

Abstract

A new TWOPEG-D version of the event generator TWOPEG was developed. This new version simulates the quasi-free process of double-pion electroproduction off the proton that moves in the deuteron target. The underlying idea is the equivalence of the moving proton experiment performed with fixed laboratory beam energy to the proton at rest experiment conducted with effective beam energy different from the laboratory one. This effective beam energy differs event by event and is determined by the boost from the Lab system to the proton rest frame. The Fermi momentum of the target proton is generated according to the Bonn potential. The specific aspects of the deuteron target data analysis are discussed. The plots that illustrate the performance of TWOPEG-D are given. The link to the code is provided. The generator was tested in the analysis of the CLAS data on electron scattering off the deuteron target.