J. Caballero - Academia.edu (original) (raw)

Papers by J. Caballero

Research paper thumbnail of General study of superscaling in quasielastic(e,e')and(ν,μ)reactions using the relativistic impulse approximation

Physical Review C, 2006

The phenomenon of superscaling for quasielastic lepton induced reactions at energies of a few GeV... more The phenomenon of superscaling for quasielastic lepton induced reactions at energies of a few GeV is investigated within the framework of the relativistic impulse approximation. A global analysis of quasielastic inclusive electron and charged-current neutrino scattering reactions on nuclei is presented. Scaling and superscaling properties are shown to emerge from both types of processes. The crucial role played by final state interactions is evaluated by using different approaches. The asymmetric shape presented by the experimental scaling function, with a long tail in the region of positive values of the scaling variable, is reproduced when the interaction in the final state between the knockout nucleon and the residual nucleus is described within the relativistic mean field approach. The impact of gauge ambiguities and off-shell effects in the scaling function is also analyzed.

Research paper thumbnail of Final-state interactions in the superscaling analysis of neutral-current quasielastic neutrino scattering

Physical Review C, 2008

Effects of strong final-state interactions in the superscaling properties of neutral-current quas... more Effects of strong final-state interactions in the superscaling properties of neutral-current quasielastic neutrino cross sections are investigated using the Relativistic Impulse Approximation as guidance. First-and second-kind scaling are analyzed for neutrino beam energies ranging from 1 to 2 GeV for the cases of 12 C, 16 O and 40 Ca. Different detection angles of the outgoing nucleon are considered in order to sample various nucleon energy regimes. Scaling of the second kind is shown to be very robust. Validity of first-kind scaling is found to be linked to the kinematics of the process. Superscaling still prevails even in the presence of very strong final-state interactions, provided that some kinematical restrains are kept, and the conditions under which superscaling can be applied to predict neutral-current quasielastic neutrino scattering are determined.

Research paper thumbnail of Induced nucleon polarization and meson-exchange currents in (e,e′p) reactions

Physical Review C, 2004

Nucleon recoil polarization observables in (e, e ′ p) reactions are investigated using a semirela... more Nucleon recoil polarization observables in (e, e ′ p) reactions are investigated using a semirelativistic distorted-wave model which includes one-and two-body currents with relativistic corrections. Results for the induced polarization asymmetry are shown for closed-shell nuclei and a comparison with available experimental data for 12 C is provided. A careful analysis of meson exchange currents shows that they may affect significantly the induced polarization for high missing momentum.

Research paper thumbnail of Longitudinal and transverse scaling functions within the coherent density fluctuation model

Physical Review C, 2009

We extend our previous description of the superscaling phenomenon in inclusive electron scatterin... more 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 Model (RFG) within which the scaling variable ψ ′ was introduced. In this work we propose a new modified CDFM approach to calculate the total, longitudinal and transverse scaling functions built up from the hadronic tensor and the longitudinal and transverse response functions in the RFG. We test the superscaling behavior of the new CDFM scaling functions by calculating the cross sections of electron scattering (in QE-and ∆-region for nuclei with 12 ≤ A ≤ 208 at different energies and angles) and comparing to available experimental data. The new modified CDFM approach is extended to calculate charge-changing neutrino and antineutrino scattering on 12 C at 1 GeV incident energy.

Research paper thumbnail of Superscaling Predictions for Neutral Current Quasielastic Neutrino-Nucleus Scattering

Physical Review Letters, 2008

The application of superscaling ideas to predict neutral-current (NC) quasielastic (QE) neutrino ... more The application of superscaling ideas to predict neutral-current (NC) quasielastic (QE) neutrino cross sections is investigated. The relativistic impulse approximation (RIA) using the same relativistic mean field potential (RMF) for both initial and final nucleons-a model that reproduces the experimental e; e 0 scaling function-is used to illustrate our findings. While NC reactions are apparently not well suited for scaling analyses, to a large extent, the RIA-RMF predictions do exhibit superscaling. Independence of the scaled response on the nuclear species is very well fulfilled. The RIA-RMF NC superscaling function is in good agreement with the experimental e; e 0 one. The idea that electroweak processes can be described with a universal scaling function, provided that mild restrictions on the kinematics are assumed, is shown to be valid.

Research paper thumbnail of Quasielastic charged-current neutrino-nucleus scattering

Research paper thumbnail of Superscaling and neutral current quasielastic neutrino-nucleus scattering

The superscaling analysis is extended to include quasielastic (QE) scattering via the weak neutra... more 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 applied to neutral current neutrino and antineutrino scattering with energies of 1 GeV from 12 C with a proton and neutron knockout (uchannel inclusive processes). The results are compared with those obtained using the scaling function from the relativistic Fermi gas model and the scaling function as determined from the superscaling analysis (SuSA) of QE electron scattering.

Research paper thumbnail of Relativistic models for quasielastic neutrino scattering

Neutrino interactions offer unique opportunities for exploring fundamental questions in different... more Neutrino interactions offer unique opportunities for exploring fundamental questions in different domains of physics. The mass of the neutrino remains one of the greatest puzzles in elementary particle physics. In recent years, a number of positive neutrino oscillation signals made the claims of nonzero neutrino masses irrefutable [1] and boosted the interest in this issue.

Research paper thumbnail of General study of superscaling in quasielastic(e,e')and(ν,μ)reactions using the relativistic impulse approximation

Physical Review C, 2006

The phenomenon of superscaling for quasielastic lepton induced reactions at energies of a few GeV... more The phenomenon of superscaling for quasielastic lepton induced reactions at energies of a few GeV is investigated within the framework of the relativistic impulse approximation. A global analysis of quasielastic inclusive electron and charged-current neutrino scattering reactions on nuclei is presented. Scaling and superscaling properties are shown to emerge from both types of processes. The crucial role played by final state interactions is evaluated by using different approaches. The asymmetric shape presented by the experimental scaling function, with a long tail in the region of positive values of the scaling variable, is reproduced when the interaction in the final state between the knockout nucleon and the residual nucleus is described within the relativistic mean field approach. The impact of gauge ambiguities and off-shell effects in the scaling function is also analyzed.

Research paper thumbnail of Final-state interactions in the superscaling analysis of neutral-current quasielastic neutrino scattering

Physical Review C, 2008

Effects of strong final-state interactions in the superscaling properties of neutral-current quas... more Effects of strong final-state interactions in the superscaling properties of neutral-current quasielastic neutrino cross sections are investigated using the Relativistic Impulse Approximation as guidance. First-and second-kind scaling are analyzed for neutrino beam energies ranging from 1 to 2 GeV for the cases of 12 C, 16 O and 40 Ca. Different detection angles of the outgoing nucleon are considered in order to sample various nucleon energy regimes. Scaling of the second kind is shown to be very robust. Validity of first-kind scaling is found to be linked to the kinematics of the process. Superscaling still prevails even in the presence of very strong final-state interactions, provided that some kinematical restrains are kept, and the conditions under which superscaling can be applied to predict neutral-current quasielastic neutrino scattering are determined.

Research paper thumbnail of Induced nucleon polarization and meson-exchange currents in (e,e′p) reactions

Physical Review C, 2004

Nucleon recoil polarization observables in (e, e ′ p) reactions are investigated using a semirela... more Nucleon recoil polarization observables in (e, e ′ p) reactions are investigated using a semirelativistic distorted-wave model which includes one-and two-body currents with relativistic corrections. Results for the induced polarization asymmetry are shown for closed-shell nuclei and a comparison with available experimental data for 12 C is provided. A careful analysis of meson exchange currents shows that they may affect significantly the induced polarization for high missing momentum.

Research paper thumbnail of Longitudinal and transverse scaling functions within the coherent density fluctuation model

Physical Review C, 2009

We extend our previous description of the superscaling phenomenon in inclusive electron scatterin... more 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 Model (RFG) within which the scaling variable ψ ′ was introduced. In this work we propose a new modified CDFM approach to calculate the total, longitudinal and transverse scaling functions built up from the hadronic tensor and the longitudinal and transverse response functions in the RFG. We test the superscaling behavior of the new CDFM scaling functions by calculating the cross sections of electron scattering (in QE-and ∆-region for nuclei with 12 ≤ A ≤ 208 at different energies and angles) and comparing to available experimental data. The new modified CDFM approach is extended to calculate charge-changing neutrino and antineutrino scattering on 12 C at 1 GeV incident energy.

Research paper thumbnail of Superscaling Predictions for Neutral Current Quasielastic Neutrino-Nucleus Scattering

Physical Review Letters, 2008

The application of superscaling ideas to predict neutral-current (NC) quasielastic (QE) neutrino ... more The application of superscaling ideas to predict neutral-current (NC) quasielastic (QE) neutrino cross sections is investigated. The relativistic impulse approximation (RIA) using the same relativistic mean field potential (RMF) for both initial and final nucleons-a model that reproduces the experimental e; e 0 scaling function-is used to illustrate our findings. While NC reactions are apparently not well suited for scaling analyses, to a large extent, the RIA-RMF predictions do exhibit superscaling. Independence of the scaled response on the nuclear species is very well fulfilled. The RIA-RMF NC superscaling function is in good agreement with the experimental e; e 0 one. The idea that electroweak processes can be described with a universal scaling function, provided that mild restrictions on the kinematics are assumed, is shown to be valid.

Research paper thumbnail of Quasielastic charged-current neutrino-nucleus scattering

Research paper thumbnail of Superscaling and neutral current quasielastic neutrino-nucleus scattering

The superscaling analysis is extended to include quasielastic (QE) scattering via the weak neutra... more 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 applied to neutral current neutrino and antineutrino scattering with energies of 1 GeV from 12 C with a proton and neutron knockout (uchannel inclusive processes). The results are compared with those obtained using the scaling function from the relativistic Fermi gas model and the scaling function as determined from the superscaling analysis (SuSA) of QE electron scattering.

Research paper thumbnail of Relativistic models for quasielastic neutrino scattering

Neutrino interactions offer unique opportunities for exploring fundamental questions in different... more Neutrino interactions offer unique opportunities for exploring fundamental questions in different domains of physics. The mass of the neutrino remains one of the greatest puzzles in elementary particle physics. In recent years, a number of positive neutrino oscillation signals made the claims of nonzero neutrino masses irrefutable [1] and boosted the interest in this issue.