Spectral function approach in NuWro: modeling of multinucleon final states in quasielastic scattering

Artur M. Ankowski; Rwik Dharmapal Banerjee; Jan T. Sobczyk; José L. Bonilla; Krzysztof M. Graczyk; Beata E. Kowal; Hemant Prasad

arXiv · 2508.10101

Spectral function approach in NuWro: modeling of multinucleon final states in quasielastic scattering

Artur M. Ankowski·Rwik Dharmapal Banerjee·Jan T. Sobczyk·José L. Bonilla·Krzysztof M. Graczyk·Beata E. Kowal·Hemant Prasad

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Abstract

Neutrino-oscillation experiments performed in the few-GeV energy region create an urgent demand for a significant improvement in the accuracy of modeling of neutrino interactions with atomic nuclei. Here, we report an updated implementation of the spectral function approach in the \nuwro{} Monte Carlo generator, which consistently treats multinucleon final-states in quasielastic scattering at the inclusive and exclusive level. After validating its accuracy against inclusive electron-scattering data, we compare its predictions to various neutrino cross sections from MicroBooNE. We find that with the multinucleon contribution, these data are reproduced with $\chi^2$ per degree of freedom of 1.3--1.8, compared to 2.7--7.2 without it.

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Artur M. Ankowski, Rwik Dharmapal Banerjee, Jan T. Sobczyk, José L. Bonilla, Krzysztof M. Graczyk, Beata E. Kowal, Hemant Prasad. 2025-08-13. Spectral function approach in NuWro: modeling of multinucleon final states in quasielastic scattering. https://arxiv.org/abs/2508.10101

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