Determination of the axial nucleon form factor from the MiniBooNE data

作者：Butkevich A V^*; Perevalov D

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, 89(5): 053014.

DOI：10.1103/PhysRevD.89.053014

Both neutrino and antineutrino charged-current quasielastic scattering on a carbon target are studied to investigate the nuclear effect on the determination of the axial form factor F-A(Q(2)) . A method for extraction of F-A(Q(2)) from the flux-integrated d sigma/dQ(2) cross section of (anti)neutrino scattering on nuclei is presented. Data from the MiniBooNE experiment are analyzed in the relativistic distorted-wave impulse approximation, the Fermi gas model, and the Fermi gas model with enhancements in the transverse cross section. We found that the values of the axial form factor, extracted in the impulse approximation and predicted by the dipole approximation with the axial mass MA approximate to 1.37 GeV, are in good agreement. The agreement between the extracted form factor and meson-dominance ansatz also is good. On the other hand, the Q(2) dependence of F-A extracted in the approach with the transverse enhancement is found to differ significantly from the dipole approximation.

• 出版日期2014-3-26