Two-body current and axial form factor effects in charged-current quasielastic neutrino-nucleus scattering within the NEUT event generator
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911638880256000 |
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| author | Franco-Munoz, T. McKean, J. García-Marcos, J. Hooft, M. González-Jiménez, R. Jachowicz, N. Udías, J. M. |
| author_facet | Franco-Munoz, T. McKean, J. García-Marcos, J. Hooft, M. González-Jiménez, R. Jachowicz, N. Udías, J. M. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_00756 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Two-body current and axial form factor effects in charged-current quasielastic neutrino-nucleus scattering within the NEUT event generator Franco-Munoz, T. McKean, J. García-Marcos, J. Hooft, M. González-Jiménez, R. Jachowicz, N. Udías, J. M. Nuclear Theory 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. |
| title | Two-body current and axial form factor effects in charged-current quasielastic neutrino-nucleus scattering within the NEUT event generator |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2605.00756 |