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Adamson, P.
Physical review. D, Particles, fields, gravitation, and cosmology, 01/2015, Letnik: 91, Številka: 1Journal Article
Kinematic distributions from an inclusive sample of 1.41×106 charged-current νμ interactions on iron, obtained using the MINOS near detector exposed to a wide-band beam with peak flux at 3 GeV, are compared to a conventional treatment of neutrino scattering within a Fermi gas nucleus. Results are also used to guide the selection of a subsample enriched in quasielastic νμFe interactions, containing an estimated 123,000 quasielastic events of incident energies 1 < Eν < 8 GeV, with < Eν > = 2.79 GeV. Four additional subsamples representing topological and kinematic sideband regions to quasielastic scattering are also selected for the purpose of evaluating backgrounds. Comparisons using subsample distributions in four-momentum transfer Q2 show the Monte Carlo model to be inadequate at low Q2. Its shortcomings are remedied via inclusion of a Q2-dependent suppression function for baryon resonance production, developed from the data. A chi-square fit of the resulting Monte Carlo simulation to the shape of the Q2 distribution for the quasielastic-enriched sample is carried out with the axial-vector mass MA of the dipole axial-vector form factor of the neutron as a free parameter. Furthermore, the effective MA which best describes the data is 1.23+0.13-0.09(fit)+0.12-0.15(syst) GeV.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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