Comparative Study of BeAGLE and DJANGOH Event Generators for Electron–Ion Collider Simulations

Chih Yun Han^1*, Kai Feng Chen¹, Yang Ting Chien², Meng Hsiu Kuo³

¹Department of physics, National Taiwan University, Taipei, Taiwan
²Department of Physics & Astronomy, Georgia State University, Atlanta, GA, USA
³University of Tsukuba, Ibaraki, Japan

* Presenter:Chih Yun Han, email:r12222044@ntu.edu.tw

The Electron–Ion Collider (EIC) will provide a powerful facility to explore the partonic structure of nucleons and nuclei. This study presents a comparative analysis between two Monte Carlo event generators, BeAGLE and DJANGOH, both applied to simulate deep inelastic scattering (DIS) processes in electron–proton and electron–nucleus collisions. BeAGLE incorporates nuclear geometry, in-medium transport, and remnant break-up models, while DJANGOH focuses on single-nucleon DIS with nPDF corrections. We generate e-p, e-d, and e-Au samples and analyze them using the eic-smear framework and FastJet clustering. Comparisons of multiplicity, η distributions, and jet-charge observables indicate that BeAGLE better captures nuclear-medium effects and A-scaling behavior than DJANGOH. Furthermore, target-jet substructure studies show clear differences in u/d quark charge separation and momentum correlations. These results help quantify the limitations of nucleon-based models and support future EIC physics simulations with realistic nuclear effects.

Keywords: Electron Ion Collider, Large Hadron Collider, Deep Inelastic Scattering, Jet Substructure, Monte Carlo event generator