Phenomenology 2025 Symposium

Global Extraction of the Electromagnetic Response Functions (RL and RT) for 12C, 40Ca and 56Fe and Comparisons to Nuclear Theory and Neutrino/Electron Monte Carlo Generators

20 May 2025, 18:15

15m

David Lawrence Hall 203, University of Pittsburgh

Neutrino Physics Neutrino

Speaker

Arie Bodek (University of Rochester (US))

Description

We perform a global extraction of the ${}^{12}\mathrm{C}$, ${}^{40}\mathrm{C}\mathrm{a}$ and ${}^{56}\mathrm{F}\mathrm{e}$ longitudinal (${\mathcal{R}}_L$) and transverse (${\mathcal{R}}_T$) nuclear electromagnetic response functions from an analysis of all available electron scattering data on these nuclei. The response functions are extracted for energy transfer $\nu$, spanning the nuclear excitation, quasielastic (QE) scattering with one nucleon (1p1h) and two nucleon (2p2h) final states, and the resonance and inelastic continuum. We extract ${\mathcal{R}}_L$ and ${\mathcal{R}}_T$ as functions of $\nu$ for both fixed values of $Q^2$ and also for fixed values of 3-momentum transfer $\mathbf{q}$. Given the nuclear physics common to both electron and neutrino scattering from nuclei, extracted response functions from electron scattering spanning a large range of $Q^2$ and $\nu$ also provide a powerful tool for validation and tuning of neutrino Monte Carlo (MC) generators. For ${}^{12}\mathrm{C}$ we compare the measurements to theoretical predictions including Energy Dependent-Relativistic Mean Field(ED-RMF), Green's Function Monte Carlo (GFMC), Short Time Approximation Quantum Monte Carlo(STA-QMC), an improved superscaling model (SuSAv2), Correlated Fermi Gas"(CFG), as well as the Nuwro and Achilles generators. For ${}^{12}\mathrm{C}$ we find that combining the ED-RMF-QE-1p1h predictions with the SuSAv2-MEC-2p2h predictions provides a good description of ${\mathcal{R}}_L$ and ${\mathcal{R}}_T$ for both single nucleon (from QE and nuclear excitations) and two nucleon final states over the entire kinematic range. For ${}^{40}\mathrm{C}\mathrm{a}$ and ${}^{56}\mathrm{F}\mathrm{e}$ we focus on comparisons of the measurements to the predictions of ED-RMF and SuSAv2.

Presentation materials

DPF_2025_Bodek.pdf

https://arxiv.org/abs/2409.10637

https://arxiv.org/abs/2410.15991