We present an extraction of the E2/M1 ratio of the Δ(1232) from experimental data applying an effective Lagrangian model. We compare the result obtained with different nucleonic models and we reconcile the experimental results with the lattice QCD calculations.
The E2/M1 ratio (EMR) of the (1232) is extracted from the world data in pion photoproduction by means of an effective Lagrangian approach (ELA). This quantity has been derived within a crossing symmetric, gauge invariant, and chiral symmetric Lagrangian model which also contains a consistent modern treatment of the (1232) resonance. The bare...
Scalar, baryon and vector-current densities in coordinate and momentum space are calculated within a relativistic mean-field model. The role of the low components of the bound nucleon wave function is investigated in detail for different spin-orbit partner shells. We show that the relative importance of the negative-energy projection components...
The helicity dependence of the γ d→π−pp, γ d→π+nn, and γ d→π0np reaction channels is studied for incident photon energies from threshold up to the (1232) resonance with inclusion of leading πNN effects. The doubly polarized total and differential cross sections for parallel and antiparallel helicity states are predicted....
We extend our previous description of the superscaling phenomenon in inclusive electron scattering within the coherent density fluctuation model (CDFM). This model is a natural extension to finite nuclei of the relativistic Fermi gas (RFG) model within which the scaling variable ψ' was introduced. In this work we propose a new modified CDFM...
A Hartree-Bose mean-field approximation for the IBM-3 is presented. A Hartree-Bose transformation from the spherical to the deformed bosons with charge-dependent parameters is proposed which allows bosonic pair correlations and includes higher angular momentum bosons. The formalism contains previously proposed IBM-2 and IBM-3 intrinsic states...
Predictions for electron induced proton knockout from p1/2 and p3/2 shells in 16O are presented using various approximations for the relativistic nucleonic current. Results for differential cross section, transverse-longitudinal response ( RTL), and left-right asymmetry ATL are compared at |Q2|=0.8(GeV/c)2. We show that there are important...
The superscaling analysis is extended to include quasielastic (QE) scattering via the weak neutral current (NC) of neutrinos and antineutrinos from nuclei. The scaling function obtained within the coherent density fluctuation model (CDFM) [used previously in calculations of QE inclusive electron and charge-changing (CC) neutrino scattering] is...
We use the relativistic distorted wave impulse approximation to analyze data on 16O(e,e′p)15N at |Q2|<~0.4(GeV/c)2 that were obtained by different groups and seemed controversial. Results for differential cross sections, response functions, and ATL asymmetry are discussed and compared to different sets of experimental data for proton knockout...
A Hartree-Bose mean-field approximation for the IBM-3 is presented. A Hartree-Bose transformation from spherical to deformed bosons with charge-dependent parameters is proposed which allows bosonic pair correlations and includes higher angular momentum bosons. The formalism contains previously proposed IBM-2 and IBM-3 intrinsic states as...
Superscaling approximation (SuSA) predictions to neutrino-induced charged-current charged pion production in the δ-resonance region are explored under MiniBooNE experimental conditions. The results obtained within SuSA for the flux-averaged double-differential cross sections of the π + production for the ν μ+CH 2 reaction as a function of the...
We study the occurrence of factorization in polarized and unpolarized observables in coincidence quasielas-tic electron scattering. Starting with the relativistic distorted wave impulse approximation, we reformulate the effective momentum approximation and show that the latter leads to observables which factorize under some specific conditions....
The superscaling analysis using the scaling function obtained within the coherent density fluctuation model is extended to calculate charge-changing neutrino and antineutrino scattering on 12C at energies from 1 to 2 GeV not only in the quasielastic but also in the Δ excitation region. The results are compared with those obtained using the...
The link between the scaling function extracted from the analysis of (e,e') cross sections and the spectral function/momentum distribution in nuclei is revisited. Several descriptions of the spectral function based on the independent particle model are employed, together with the inclusion of nucleon correlations, and effects of the energy...
We calculate the ratio of proton and neutron yields in NC induced v(v̄)-nuc\eus inelastic scattering at neutrino energies of about 1 GeV. We show that this ratio depends very weakly on the nuclear models employed and that in v and v̄ cases the ratios have different sensitivity to the axial and vector strange form factors; moreover the ratio of...
Recoil nucleon transferred polarization observables in coincidence quasielastic electron scattering are studied within the relativistic distorted wave impulse approximation. Results for response functions and polarization asymmetries are discussed for proton knockout from p 1 ∕ 2 , p 3 ∕ 2 , and s 1 ∕ 2 shells in 16 O . The impact of...
Superscaling analyses of inclusive electron scattering from nuclei are extended from the quasielastic processes to the delta excitation region. The calculations of (e,e') cross sections for the target nucleus 12C at various incident electron energies are performed using scaling functions f(yf') obtained in approaches going beyond the...
Superscaling analyses of inclusive electron scattering from nuclei are extended from the quasielastic processesto the delta excitation region. The calculations of (e, e ) cross sections for the target nucleus 12 C at various incident electron energies are performed using scaling functions f (ψ ) obtained in approaches going beyondthe...
Charge-current quasielastic (anti)neutrino scattering cross sections on a 12C target are analyzed using a spectral function S(p,E) that gives a scaling function in accordance with the (e,e′) scattering data. The spectral function accounts for the nucleon-nucleon (NN) correlations, it has a realistic energy dependence, and natural orbitals (NOs)...
Neutral current quasielastic (anti)neutrino scattering cross sections on a C12 target are analyzed using a realistic spectral function S(p,E) that gives a scaling function in accordance with the (e,e′) scattering data. The spectral function accounts for the nucleon-nucleon (NN) correlations by using natural orbitals from the Jastrow correlation...
Recent progresses on the relativistic modeling of neutrino-nucleus reactions are presented and the results are compared with high precision experimental data in a wide energy range