String Parton Models in Geant4

TL;DR

This paper discusses the implementation and validation of string parton models in Geant4, enabling detailed simulation of high-energy soft reactions involving nucleons, pions, kaons, and heavy ions for particle physics research.

Contribution

It introduces extended string parton models in Geant4, including new implementations for pion, kaon, and heavy ion reactions, with validation and application results.

Findings

Successful extension of Geant4 to include pion, kaon, and heavy ion reactions

Validation results show good agreement with experimental data

Models are effectively used in calorimeter simulations

Abstract

Dual parton and quark gluon string model are the by now almost standard theoretical techniques by which one can arrive at precision description of high energy, soft, inclusive reactions. These reactions make the part of jets at energies that contribute strongly to discovery channels such as H$\to$WWjj, or search for compositeness at the highest transverse momenta. The above modeling approach is available with Geant4 for nucleon induced reactions since the first release. Its object oriented design and parameter set was recently extended to allow for simulation of pion and kaon induced reactions, as well as heavy ion reactions. We will briefly describe the theory and algorithmic approaches that underly the modeling, show the object oriented designs and component structure of the string parton sub-systems of Geant4, present validation/verification results pertaining to these models, as well as results concerning their usage in calorimeter simulation.