Testing CCQE and 2p2h models in the NEUT neutrino interaction generator with published datasets from the MiniBooNE and MINERvA experiments

TL;DR

This paper evaluates various CCQE and 2p2h neutrino interaction models in the NEUT generator by fitting to MiniBooNE and MINERvA data, aiming to improve T2K oscillation analysis accuracy.

Contribution

It introduces a comprehensive fit of recent models to experimental data, selecting a default model and constraining uncertainties for T2K analyses.

Findings

Modified relativistic Fermi gas with multinucleon interactions best fits the data.

The selected model reduces cross section uncertainties for T2K.

Provides a benchmark for future neutrino interaction modeling.

Abstract

The MiniBooNE large axial mass anomaly has prompted a great deal of theoretical work on sophisticated Charged Current Quasi-Elastic (CCQE) neutrino interaction models in recent years. As the dominant interaction mode at T2K energies, and the signal process in oscillation analyses, it is important for the T2K experiment to include realistic CCQE cross section uncertainties in T2K analyses. To this end, T2K's Neutrino Interaction Working Group has implemented a number of recent models in NEUT, T2K's primary neutrino interaction event generator. In this paper, we give an overview of the models implemented, and present fits to published muon neutrino and muon antineutrino CCQE cross section measurements from the MiniBooNE and MINERvA experiments. The results of the fits are used to select a default cross section model for future T2K analyses, and to constrain the cross section uncertainties of the model. We find a model consisting of a modified relativistic Fermi gas model and multinucleon interactions most consistently describes the available data.