Isospin decomposition of the $\gamma^{(*)} N \to N^*$ transitions as input for constructing models of neutrino-induced reactions in the nucleon resonance region

TL;DR

This paper analyzes vector current-induced nucleon to resonance transitions using coupled-channels models to improve neutrino reaction models in the resonance region.

Contribution

It provides a detailed isospin decomposition of transition matrix elements using a dynamical coupled-channels approach, aiding neutrino reaction modeling.

Findings

Matrix elements for nucleon-resonance transitions determined

Enhanced understanding of meson photo- and electro-production data

Foundation for unified neutrino reaction models at J-PARC

Abstract

We present our recent efforts to determine the matrix elements associated with the transition between the nucleon and a nucleon resonance induced by the vector current, which are necessary ingredients for models of neutrino-induced reactions in the resonance region. This is accomplished by making the comprehensive analysis of the data for various meson photo- and electro-production reactions off the nucleon within a sophisticated coupled-channels framework, which is known as the ANL-Osaka dynamical coupled-channels model. We also give a brief introduction to our project for constructing a unified neutrino reaction model conducted at the J-PARC Branch of the KEK Theory Center.