The Δ(1232) resonance transition form factor

Old and new measurements of inclusive e--p cross sections in the Δ(1232) resonance region have been combined, and a global data fit has been made. Using this fit to parameterize the nonresonant background, the transition form factors have been extracted out to a four-momentum transfer, Q2, of 9.8 (GeV/c)2. The results are systematically higher than those from a previous analysis, but agree within errors. A similar analysis has been done with e--d cross sections, and σn/σp in the Δ(1232) resonance region has been extracted out to a Q2 of 7.9 (GeV/c)2. σn/σp for Δ(1232) production is consistent with unity, while σn/σp for the nonresonant background is constant with Q2 at approximately 0.4