Single pion-production and pion propagation in Achilles
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910011888762880 |
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| author | Isaacson, Joshua Jay, William Lovato, Alessandro Machado, Pedro Nikolakopoulos, Alexis Rocco, Noemi Steinberg, Noah |
| author_facet | Isaacson, Joshua Jay, William Lovato, Alessandro Machado, Pedro Nikolakopoulos, Alexis Rocco, Noemi Steinberg, Noah |
| contents | We extend the applicability of Achilles (A CHIcagoLand Lepton Event Simulator) by incorporating the single-pion production mechanism in a fully exclusive fashion. The electroweak interaction vertex is modeled by combining the state-of-the-art Dynamical Coupled-Channels approach with realistic hole spectral functions, which account for correlations in both the initial target state and the residual spectator system. Final-state interactions are treated using a semi-classical intranuclear cascade that leverages nuclear configurations to determine the correlated spatial distribution of protons and neutrons. The meson-baryon scattering amplitudes used in the cascade are computed within the Dynamical Coupled-Channels framework, consistent with the electroweak vertex. To model pion absorption, we employ the optical potential approach of Oset and Salcedo. As an alternative approach, we explicitly model the production and propagation of resonances which mediate pion-nucleon scattering and pion absorption. We validate out approach against pion-nucleon and pion-nucleus scattering data, and present comparisons with electron- and neutrino-nucleus measurements from e4$ν$, T2K, MINER$ν$A, and MicroBooNE. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_19213 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single pion-production and pion propagation in Achilles Isaacson, Joshua Jay, William Lovato, Alessandro Machado, Pedro Nikolakopoulos, Alexis Rocco, Noemi Steinberg, Noah High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory We extend the applicability of Achilles (A CHIcagoLand Lepton Event Simulator) by incorporating the single-pion production mechanism in a fully exclusive fashion. The electroweak interaction vertex is modeled by combining the state-of-the-art Dynamical Coupled-Channels approach with realistic hole spectral functions, which account for correlations in both the initial target state and the residual spectator system. Final-state interactions are treated using a semi-classical intranuclear cascade that leverages nuclear configurations to determine the correlated spatial distribution of protons and neutrons. The meson-baryon scattering amplitudes used in the cascade are computed within the Dynamical Coupled-Channels framework, consistent with the electroweak vertex. To model pion absorption, we employ the optical potential approach of Oset and Salcedo. As an alternative approach, we explicitly model the production and propagation of resonances which mediate pion-nucleon scattering and pion absorption. We validate out approach against pion-nucleon and pion-nucleus scattering data, and present comparisons with electron- and neutrino-nucleus measurements from e4$ν$, T2K, MINER$ν$A, and MicroBooNE. |
| title | Single pion-production and pion propagation in Achilles |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2508.19213 |