Sensitivity of Neutrino-Nucleus Interaction Measurements to 2p2h Excitations

TL;DR

This paper uses the GiBUU model to analyze neutrino-nucleus interactions, determining that isospin T=0 provides a better fit to T2K data, enhancing understanding of 2p2h multinucleon effects.

Contribution

It introduces a detailed transport theory calculation linking 2p2h correlations to isospin, improving the modeling of neutrino-nucleus interactions.

Findings

T=0 isospin state fits T2K data better.

Enhanced consistency between electron- and neutrino-nucleus reactions.

Quantitative assessment of 2p2h contributions in cross sections.

Abstract

We calculate the charged-current cross sections obtained at the T2K off-axis near detector for $\nu_\mu$-induced events without pions and any number of protons in the final state using transport theory as encoded in the GiBUU model. In a comparison with recent T2K data the strength of the 2p2h multinucleon correlations is determined. Linking this to the isospin (T) of the initial nuclear state, it is found that T=0 leads to a significantly better fit of the recent cross sections obtained by T2K, thus achieving consistency of the 2p2h multi-nucleon correlation contributions between electron-nucleus and neutrino-nucleus reactions.