Abstract
We compare the characteristics of the charged-current quasielastic neutrino and antineutrino scattering obtained in two different nuclear models, the phenomenological SuperScaling Approximation and the model using a realistic spectral function S(p, epsilon) that gives a scaling function in accordance with the (e, e') scattering data, with the recent data published by the MINER nu A Collaboration. The spectral function accounts for the nucleon-nucleon (NN) correlations by using natural orbitals from the Jastrow correlation method and has a realistic energy dependence. Both models provide a good description of the data without the need of an ad hoc increase of the value of the mass parameter in the axial-vector dipole form factor.
Highlights
The MINERνA Collaboration has recently measured differential cross sections for neutrino and antineutrino charged-current quasielastic (CCQE) (49)scattering on a hydrocarbon target [1, 2]
We present results corresponding to two different nuclear models: the SuSA (SuperScaling Approximation) and the model using a realistic spectral function S(p, E)
The FSI leads to an increase of about 2% using spectral functions with HO and natural orbitals (NOs) s.p. wave functions, almost independently of the neutrino energy
Summary
The MINERνA Collaboration has recently measured differential cross sections for neutrino and antineutrino charged-current quasielastic (CCQE). At lower energies Eν ∼ 0.8 GeV, the MiniBooNE experiment has reported [3] CCQE cross sections that are higher than most theoretical predictions based on the impulse approximation (IA), leading to the suggestion that non-QE processes induced by two-body currents may play a significant role in this energy domain [4,5,6,7] These effects have sometimes been simulated, in the Relativistic Fermi Gas (RFG) framework, by a value of the nucleon axial-vector dipole mass MA = 1.35 GeV [3], which is significantly larger than the standard value MA = 1.03 GeV extracted from neutrino–deuterium quasielastic scattering.
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