Measurements of the Delta(1232) Transition Form Factor and the Ratio sigma_nσ_p From Inelastic Electron-Proton and Electron-Deuteron Scattering

Details Measurements of the Delta(1232) Transition Form Factor and the Ratio sigma_nσ_p From Inelastic Electron-Proton and Electron-Deuteron Scattering Measurements of the Delta(1232) Transition Form Factor and the Ratio sigma_nσ_p From Inelastic Electron-Proton and Electron-Deuteron Scattering

1996-12-19

arxiv.org/abs/hep-ph/9612416v1

Phys.Rev.D58:032003,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 figures. 42 pages, including figures. submitted to Physical Review D

Scientific paper

10.1103/PhysRevD.58.032003

Measurements of inclusive electron-scattering cross sections using hydrogen and deuterium targets in the region of the Delta(1232) resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the four-momentum transfer squared range 1.64 < Q^2 < 6.75 (GeV/c)^2 and from previous data over the range 2.41 < Q^2 < 9.82 (GeV/c)^2. The results confirm previous reports that the Delta(1232) transition form factor decreases more rapidly with Q^2 than expected from perturbative QCD. The ratio of sigma _n \sigma_p in the \Delta(1232) resonance region has been extracted from the deuteron data for this experiment in the range 1.64 < Q^2 < 3.75 (GeV/c)^2 and for a previous experiment in the range 2.4 < Q^2 < 7.9 (GeV/c)^2. A study has been made of the model dependence of these results. This ratio sigma_n\sigma_p for \Delta(1232) production is slightly less than unity, while sigma_n\sigma_p for the nonresonant cross sections is approximately 0.5, which is consistent with deep inelastic scattering results.

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