3 research outputs found
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Measurement of single p0 production by coherent neutral-current ? Fe interactions in the MINOS Near Detector
Forward single p0 production by coherent neutral-current interactions, ?A ? ?Ap0, is investigated using a 2.8 × 10^20 protons-on-target exposure of the MINOS Near Detector. For single-shower topologies, the event distribution in production angle exhibits a clear excess above the estimated background at very forward angles for visible energy in the range 1–8 GeV. Cross sections are obtained for the detector medium comprised of 80% iron and 20% carbon nuclei with = 48, the highest- target used to date in the study of this coherent reaction. The total cross section for coherent neutral-current single p0 production initiated by the ?µ flux of the NuMI low-energy beam with mean (mode) E? of 4.9 GeV (3.0 GeV), is 77.6±5.0(stat)+15.0-16.8 (syst) × 10-40 cm2 pernucleus. The results are in good agreement with predictions of the Berger-Sehgal model.</a
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Study of quasielastic scattering using charged-current ?µ-iron interactions in the MINOS near detector
Kinematic distributions from an inclusive sample of 1.41 × 10^6 charged-current ?µ 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 ?µFe interactions, containing an estimated 123,000 quasielastic events of incident energies 1 < E? < 8 GeV, with hE?i ¼ 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 fourmomentum 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 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. 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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Combined analysis of ?µ disappearance and ?µ ? ?e appearance in MINOS using accelerator and atmospheric neutrinos
We report on a new analysis of neutrino oscillations in MINOS using the complete set of accelerator and atmospheric data. The analysis combines the ?µ disappearance and ?e appearance data using the three-flavor formalism. We measure |?m^2 32| = [2.28–2.46] × 10-3 eV^2 (68% C.L.) and sin^2 ?23 = 0.35–0.65 (90% C.L.) in the normal hierarchy, and |?m^2 32| = [2.32–2.53] × 10-3 eV^2 (68% C.L.) and sin^2 ?23 = 0.34–0.67 (90% C.L.) in the inverted hierarchy. The data also constrain dCP, the ?23 octant degeneracy and the mass hierarchy; we disfavor 36% (11%) of this three-parameter space at 68% (90%) C.L