Event reweighting with the NuWro neutrino interaction generator

TL;DR

This paper introduces event reweighting in the NuWro neutrino generator, enabling efficient uncertainty analysis and potential use as a primary generator for experiments.

Contribution

It implements event reweighting for multiple interaction parameters in NuWro, enhancing its utility for experimental neutrino physics analysis.

Findings

Reweighting successfully validated against experimental data.

Potential for NuWro to serve as a primary event generator.

Improved analysis of neutrino interaction uncertainties.

Abstract

Event reweighting has been implemented in the NuWro neutrino event generator for a number of free theory parameters in the interaction model. Event reweighting is a key analysis technique, used to efficiently study the effect of neutrino interaction model uncertainties. This opens up the possibility for NuWro to be used as a primary event generator by experimental analysis groups. A preliminary model tuning to ANL and BNL data of quasi-elastic and single pion production events was performed to validate the reweighting engine.