NuSmear: Fast Simulation of Energy Smearing and Angular Smearing for Neutrino-Nucleon Scattering Events in the GENIE Event Generator

TL;DR

NuSmear is a fast, model-based simulation tool for neutrino-nucleon scattering events that efficiently approximates energy and angular smearing in GENIE, reducing computational load while maintaining accuracy.

Contribution

We introduce NuSmear, a novel, geometry-independent system that accelerates neutrino event simulation by providing quick, accurate energy and angular smearing estimates within GENIE.

Findings

NuSmear achieves high predictive accuracy in smearing simulations.

Validation shows NuSmear's results closely match detailed Monte Carlo simulations.

NuSmear significantly reduces computational time for neutrino event analysis.

Abstract

Complete Monte Carlo (MC) simulation of a neutrino experiment typically involves the lengthy and CPU-intensive process of integrating models of incoming neutrino fluxes, event generation, and detector setup. We describe a fast, geometry-independent, GENIE-based system known as NuSmear which provides preliminary simulation of energy smearing and angular smearing for neutrino-nucleon interactions. We discuss NuSmear's simulation methodology, explaining its calculation of reconstructed values through its model-based resolution computation, smearing distributions, and particle detection dependencies. We go on to validate NuSmear's performance as a fast simulation system through a series of internal and external comparisons testing its predictive accuracy and model-adherence. Finally, we briefly explore the potential for future user-customization in NuSmear.