Simulation of Dark Bremsstrahlung in GEANT4

TL;DR

This paper presents a method to simulate dark bremsstrahlung in GEANT4, enabling accurate modeling of electron and muon interactions with thick targets using the Weizsäcker-Williams approximation and event scaling, achieving better than 5% precision.

Contribution

It introduces a novel simulation technique for dark bremsstrahlung in GEANT4 that accounts for thick targets and variable lepton energies using event scaling.

Findings

Achieves better than 5% precision in simulation results.

Enables simulation of dark bremsstrahlung for electrons and muons in GEANT4.

Allows for flexible incident lepton energies and thick target modeling.

Abstract

A technique for the simulation of dark bremsstrahlung for electrons and muons in GEANT4 is presented. The total cross section is calculated using the Weizs\"{a}cker-Williams approximation and the outgoing kinematics are produced by scaling events produced in MadGraph/MadEvent to lower incident lepton energies, allowing the simulation to account for thick targets and lepton sources without fixed energies. Compared with dedicated samples produced at an arbitrary particle energy, typical precision of better than 5% is achieved.