Neutrino-Nucleon Cross-Section Model Tuning in GENIE v3

TL;DR

This paper presents a detailed tuning of the neutrino-nucleon cross-section models in GENIE v3, addressing tensions between data sets and providing improved, publicly available model configurations for neutrino interaction simulations.

Contribution

It introduces a comprehensive tuning procedure for GENIE v3 cross-section models, including systematic handling and multiple model configurations, with results made publicly accessible.

Findings

Improved agreement between inclusive and exclusive data

Multiple tuned model configurations available publicly

Enhanced handling of systematic uncertainties in data

Abstract

We summarise the results of a study performed within the GENIE global analysis framework, revisiting the GENIE bare-nucleon cross-section tuning and, in particular, the tuning of a) the inclusive cross-section, b) the cross-section of low-multiplicity inelastic channels (single-pion and double-pion production), and c) the relative contributions of resonance and non-resonance processes to these final states. The same analysis was performed with several different comprehensive cross-section model sets available in GENIE Generator v3. In this work we performed a careful investigation of the observed tensions between exclusive and inclusive data, and installed analysis improvements to handle systematics in historic data. All tuned model configurations discussed in this paper are available through public releases of the GENIE Generator. With this paper we aim to support the consumers of these physics tunes by providing comprehensive summaries of our alternate model constructions, of the relevant datasets and their systematics, and of our tuning procedure and results.