Implementation of the Martini-Ericson-Chanfray-Marteau RPA-based neutrino and antineutrino cross-section model in the GENIE neutrino event generator

TL;DR

This paper details the first implementation of a sophisticated neutrino cross-section model based on the RPA approach into the GENIE generator, enhancing the accuracy of neutrino interaction simulations.

Contribution

It introduces the integration of the Martini-Ericson-Chanfray-Marteau RPA-based model into GENIE, with validation and comparison to experimental data.

Findings

GENIE outputs align well with original model calculations.

Predictions agree reasonably with T2K and MicroBooNE data.

Implementation improves neutrino interaction modeling in GENIE.

Abstract

We discuss the first implementation of the Martini-Ericson-Chanfray-Marteau random phase approximation-based (anti)neutrino cross-section model for quasielastic (1p1h) and multinucleon (2p2h and 3p3h) excitations in the widely used GENIE neutrino event generator. Validation steps are presented, in particular, through direct comparisons of GENIE cross-section output with original calculations performed by the authors of the model. Predictions for $^{12}$C, $^{16}$O, and $^{40}$Ar are compared with some available T2K and MicroBooNE experimental measurements showing a reasonable agreement.