Electron- and neutrino-nucleus scattering from the quasielastic to the resonance region

Abstract

We present a model for electron-and neutrino-scattering off nucleons and nuclei focussing on the quasielastic and resonance region. The lepton-nucleon reaction is described within a relativistic formalism that includes, besides quasielastic scattering, the excitation of 13 N * and ∆ resonances and a non-resonant single-pion background. Recent electron-scattering data is used for the state-ofthe-art parametrizations of the vector form factors; the axial couplings are determined via PCAC and, in the case of the ∆ resonance, the axial form factor is refitted using neutrino-scattering data. Scattering off nuclei is treated within the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) framework that takes into account various nuclear effects: the local density approximation for the nuclear ground state; mean-field potentials and in-medium spectral functions. Results for inclusive scattering off Oxygen are presented and, in the case of electron-induced reactions, compared to experimental data and other models.

Charged pion production inνμinteractions on hydrocarbon at⟨Eν⟩=4.0 Eberly1, Aliaga2, Altinok3 et al. 2015Phys. Rev. D911910View full textAdd to dashboardCite

“…FSI suppresses the charged pion production cross section through pion absorption and charge exchange, and migrates pions to lower energies through scattering. These interactions are highly energy dependent, peaking between 100 and 220 MeV [59], and significantly modify the shape of dσ/dT π . The significant reduction in the total cross section is seen by comparing the solid and dashed GENIE predictions in the absolute measurement, while the energy dependence of the FSI can be clearly seen by comparing the GENIE predictions for the shape measurement.…”

Quasielastic Scattering at MiniBooNE Energies

“…As for ReE, it is obtained from ImE with a once-subtracted dispersion relation demanding that at the pole p^^ ' = w p^ + mjg. More details can be found in Ref [12].…”

“…Such a simple model already incorporates a space-momentum correlation which is absent for the Global Fermi Gas [12], and provides a framework where more elaborated many body dynamics can be naturally incorporated. In contrast to the constant binding of the SM model, here all the nucleons, initial and final, are embedded in a density and momentum dependent potential K(p,r) whose parameters have been fixed by proton-nucleus scattering data [12,13]. As a consequence, the nucleons acquire effective masses meff{p,r) given by p^ + mjf + V{p, r) = yy + »4f.…”

Coherent pion production off nuclei at T2K and MiniBooNE energies revisited

“…In Ref. [32], C A 5 (0) is kept to its GTR value and three additional parameters, that control the C A 5 (q 2 ) fall off, are fitted to the ANL data. Although ANL data are well reproduced, we find the outcome in [32] to be unphysical, as it provides a quite pronounced q 2 −dependence giving rise to a too large axial transition radius of around 1.4 fm (further details are discussed in [35]).…”