SIDIS-RC EvGen: a Monte-Carlo event generator of semi-inclusive deep inelastic scattering with the lowest-order QED radiative corrections

TL;DR

SIDIS-RC EvGen is a C++ Monte-Carlo event generator designed for semi-inclusive deep inelastic scattering studies, incorporating transverse momentum-dependent functions and lowest-order QED radiative corrections to aid in nucleon structure research.

Contribution

The paper introduces a new standalone Monte-Carlo generator that integrates recent QED calculations and TMD functions for SIDIS, enabling detailed multi-dimensional simulations.

Findings

Provides multi-dimensional binned simulation results

Includes detailed theoretical formalism and software construction

Offers example programs and numerical asymmetry results

Abstract

SIDIS-RC EvGen is a C++ standalone Monte-Carlo event generator for studies of semi-inclusive deep inelastic scattering (SIDIS) processes at medium to high lepton beam energies. In particular, the generator contains binary and library components for generating SIDS events and calculating cross sections for unpolarized or longitudinally polarized beam and unpolarized, longitudinally or transversely polarized target. The structure of the generator incorporates transverse momentum-dependent parton distribution and fragmentation functions, whereby we obtain multi-dimensional binned simulation results, which will facilitate the extraction of important information about the three-dimensional nucleon structure from SIDIS measurements. In order to build this software, we have used recent elaborate QED calculations of the lowest-order radiative effects, applied to the leading order Born cross section in SIDIS. In this paper, we provide details on the theoretical formalism as well as the construction and operation of SIDIS-RC EvGen, e.g., how we handle the event generation process and perform multi-dimensional integration. We also provide example programs, flowcharts, and numerical results on azimuthal transverse single-spin asymmetries.