The SuSA Model for Neutrino Oscillation Experiments: From Quasielastic Scattering to the Resonance Region (original) (raw)
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Physical Review C, 2016
Background: Meticulous modeling of neutrino-nucleus interactions is essential to achieve the unprecedented precision goals of present and future accelerator-based neutrino-oscillation experiments. Purpose: Confront our calculations of charged-current quasielastic cross section with the measurements of Mini-BooNE and T2K, and to quantitatively investigate the role of nuclear-structure effects, in particular, low-energy nuclear excitations in forward muon scattering. Method: The model takes the mean-field (MF) approach as the starting point, and solves Hartree-Fock (HF) equations using a Skyrme (SkE2) nucleon-nucleon interaction. Long-range nuclear correlations are taken into account by means of the continuum random-phase approximation (CRPA) framework. Results: We present our calculations on flux-folded double differential, and flux-unfolded total cross sections off 12 C and compare them with MiniBooNE and (off-axis) T2K measurements. We discuss the importance of low-energy nuclear excitations for the forward bins. Conclusions: The HF and CRPA predictions describe the gross features of the measured cross sections. They underpredict the data (more in the neutrino than in the antineutrino case) because of the absence of processes beyond pure quasielastic scattering in our model. At very forward muon scattering, low-energy HF-CRPA nuclear excitations (ω < 50 MeV) account for nearly 50% of the flux-folded cross section. This extra low-energy strength is a feature of the detailed microscopic nuclear model used here, that is not accessed in a Fermi-gas based approach.
Relativistic models for quasielastic neutrino scattering
Physical Review C, 2006
We present quasi-elastic neutrino-nucleus cross sections in the energy range from 150 MeV up to 5 GeV for the target nuclei 12 C and 56 Fe. A relativistic description of the nuclear dynamics and the neutrino-nucleus coupling is adopted. For the treatment of final-state interactions (FSI) we rely on two frameworks succesfully applied to exclusive electron-nucleus scattering: a relativistic optical potential and a relativistic multiple-scattering Glauber approximation. At lower energies, the optical-potential approach is considered to be the optimum choice, whereas at high energies a Glauber approach is more natural. Comparing the results of both calculations, it is found that the Glauber approach yields valid results down to the remarkably small nucleon kinetic energies of 200 MeV. We argue that the nuclear transparencies extracted from A(e, e ′ p) measurements can be used to obtain realistic estimates of the effect of FSI mechanisms on quasi-elastic neutrinonucleus cross sections. We present two independent relativistic plane-wave impulse approximation (RPWIA) calculations of quasi-elastic neutrino-nucleus cross sections. They agree at the percent level, showing the reliability of the numerical techniques adopted and providing benchmark RPWIA results.
Physical Review D, 2015
We report the results of a theoretical study of quasielastic electron and neutrino interactions with carbon. Our approach takes into account the effects of final-state interactions between the struck nucleon and the residual nucleus, neglected in the impulse approximation, through a generalization of the spectral function formalism. The calculated electron-scattering cross sections turn out to be in very good agreement with the available data over a broad kinematical region. The impact of nuclear effects on the reconstruction of neutrino energy in charged-current quasielastic processes is also studied, and the results of our approach are compared to the predictions of the relativistic Fermi gas model, routinely employed in most Monte Carlo simulations. At energy ∼600 MeV, we observe a sizable difference between neutrino and antineutrino scattering, important for the measurements of charge-parity symmetry violation. Our analysis suggests that a reliable determination of neutrino energy can only be obtained from models validated by a systematic comparison to the available electron scattering data.
Inelastic neutrino-nucleus scattering in the superscaling model
Proceedings of The 22nd International Workshop on Neutrinos from Accelerators — PoS(NuFact2021)
Charged-current inclusive neutrino cross sections on 12 C and 40 Ar target are analyzed using the susperscaling model SuSAv2, for the first time extended to the full inelastic region. The model contains two new ingredients: the first is a scaling function used to describe the Δ resonance region, built after subtracting from (, ′) experimental cross sections the quasielastic, two-particle two-hole, higher resonances and deep inelastic scattering (DIS) contributions arising from the SuSAv2-MEC model [1]; the second is the description of the resonance and DIS regimes through the extension to the neutrino sector of the SuSAv2-inelastic model already available for (, ′) reactions, which combines phenomenological structure functions with a nuclear scaling function. Two different options for the description of the Δ region are presented and discussed. The results of the model are tested against (, ′) data and inclusive neutrino cross-section measurements from the T2K and ArgoNEUT experiments, thus covering several kinematical regions.
A Unified Empirical Model for Quasielastic Interactions of Neutrino and Antineutrino with Nuclei
Physics of Particles and Nuclei Letters, 2020
We propose a simple empirical model for evaluating the quasielastic neutrino-and antineutrinonucleus cross sections, based on the conventional relativistic Fermi-gas model and the notion of running (dipole) axial-vector mass of the nucleon driven by two adjustable parameters (one of which is the ordinary axial mass of the nucleon). The suggested approach provides reasonable agreement with available consistent accelerator data on total, differential, and double differential quasielastic and quasielastic-like cross sections for different nuclear targets.
Modeling neutrino–nucleus interactions. Do we need a new paradigm?
The availability of the double-differential charged-current neutrino cross section, measured by the MiniBooNE collaboration using a carbon target, allows for a systematic comparison of nuclear effects in quasi-elastic electron and neutrino scattering. The results of theoretical studies based on the impulse approximation scheme and state-of-the-art models of the nuclear spectral functions suggest that the electron cross section and the flux averaged neutrino cross sections corresponding to the same target and seemingly comparable kinematical conditions can not be described within the same theoretical scheme using the value of the nucleon axial mass obtained from deuterium measurements. I analyze the assumptions underlying the treatment of electron scattering data, and argue that the development of a new paradigm, suitable for application to processes in which the lepton kinematics is not fully determined, will be required.
Neutrino-nucleus interactions: from nuclear dynamics to neutrino oscillations
EPJ Web of Conferences, 2014
We present a theory of neutrino interactions with nuclei aimed at the description of several partial cross sections, namely quasielastic and multinucleon emission, coherent and incoherent single-pion production. We put a special emphasis on the multinucleon emission channel which is related to the two particle-two hole excitations. As we suggested, this channel can account in particular for the unexpected behavior of the quasielastic cross section measured by MiniBooNE. The impact of the multinucleon emission channel on the neutrino energy reconstruction procedure hence on the determination on the neutrino oscillation parameters, is also analyzed in connection with the recent T2K and MiniBooNE results.
Highly Inelastic Neutrino-Nucleon Scattering
Physical Review D, 1970
Lower bounds for cross sections for neutrino-nucleo11 scattering summed over final hadron states at large energy and mornenturn transfer are estimated assuming the usual current-current coupling, Regge behavior, and current-algebra sun1 rules The cross sections are estimated using an added assumption of pointlike baryon constitue~its in nucleons. The cross sections compare well nith CERN bubble-chamber data.