High-precision measurements in neutrino oscillation experiments require a very accurate description of the lepton-nucleus scattering process. Several cross-section calculations are available, but important discrepancies are still present between different model predictions.
For the quasi-elastic channel, dominated by one particle-one hole excitations, an overview over several nuclear models – specifically Relativistic Fermi Gas, Super Scaling Approach, Spectral Function, Hartree-Fock and Random Phase Approximation – is presented and compared with data for electron-nucleus scattering, a very important process for testing theoretical models validity, highlighting the specific features of each approach.
Furthermore an ongoing microscopic calculation of the two particle-two hole excitations contribution to the electromagnetic response is presented, starting from the theory behind the meson exchange current definition. In the Relativistic Fermi Gas framework, the electron-nucleus cross sections are computed, for inclusive -only the outgoing lepton is detected- and semi-inclusive -the outgoing proton is detected too- processes, illustrating some details of the semi-inclusive computation. Some new results are shown.
This seminar is organized in the framework of the ESNT project on the Meson Exchange Current contributions in semi inclusive lepton nucleus scattering (MEC-neutrinos 2024).
See: https://esnt.cea.fr >>2024
INFN, Université de Turin