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arXiv · 2605.00756

Two-body current and axial form factor effects in charged-current quasielastic neutrino-nucleus scattering within the NEUT event generator

T. Franco-Munoz·J. McKean·J. García-Marcos·M. Hooft·R. González-Jiménez·N. Jachowicz·J. M. Udías
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Abstract

We present a charged-current quasielastic neutrino-nucleus scattering model based on an unfactorized representation of the spectral function, employing relativistic momentum distributions for bound nucleons and the relativistic distorted-wave impulse approximation with an energy-dependent relativistic potential to describe the scattered nucleon. The model incorporates two-body meson-exchange currents contributing to one-particle-one-hole final states and tests several axial form factor parametrizations, including recent LQCD and MINERvA fits. It is implemented in the NEUT event generator and benchmarked against T2K and MINERvA $ν_μ$-$^{12}$C CC0$π$ measurements. We find that two-body meson-exchange currents lead to a sizeable increase of the total cross section, arising from an enhancement of the transverse response, which is the dominant component in charged-current neutrino scattering. On the other hand, recent fits of the axial form factor predict larger values than the standard dipole form, yielding a systematic enhancement of the cross section. The LQCD+MINERvA parametrization tends to overestimate the data, while the MINERvA-only fit provides a more moderate increase. Overall, no single configuration consistently provides the best agreement with the different datasets.

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T. Franco-Munoz, J. McKean, J. García-Marcos, M. Hooft, R. González-Jiménez, N. Jachowicz, J. M. Udías. 2026-05-01. Two-body current and axial form factor effects in charged-current quasielastic neutrino-nucleus scattering within the NEUT event generator. https://arxiv.org/abs/2605.00756

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