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Study of quasielastic scattering using charged-current nu(mu)-iron interactions in the MINOS near detector
Anghel, I. Goodman, M. C. Paley, J. Devan, A. V. Kordosky, M. Nelson, J. K. Radovic, A. Vahle, P. Walding, J. J.
Anghel, I.
Goodman, M. C.
Paley, J.
Devan, A. V.
Kordosky, M.
Nelson, J. K.
Radovic, A.
Vahle, P.
Walding, J. J.
Abstract
Kinematic distributions from an inclusive sample of 1.41 x 10(6) charged-current nu(mu) 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 used to guide the selection of a subsample enriched in quasielastic nu Fe-mu interactions, containing an estimated 123,000 quasielastic events of incident energies 1 < E-nu < 8 GeV, with < E-nu > = 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 Q(2) show the Monte Carlo model to be inadequate at low Q(2). Its shortcomings are remedied via inclusion of a Q(2)-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 Q(2) distribution for the quasielastic-enriched sample is carried out with the axial-vector mass M-A of the dipole axial-vector form factor of the neutron as a free parameter. The effective M-A which best describes the data is 1.23(-0.09)(+0.13)(fit)(-0.15)(+0.12)(syst) GeV.
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2015-01-01
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Physics
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https://doi.org/10.1103/PhysRevD.91.012005