2009/09/12 by L. Tiator, L Tiator, D. Drechsel +5 · 1 citation
Physics and Astronomy · #Baryon #Charge (physics) #High-Energy Particle Collisions Research #Isobar #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #Transverse plane #Unitary state #hep-ph #nucl-th
paper · pdf · doi:10.1088/1674-1137/33/12/005
8 pages, 11 figures, 4 tables, Proc. of NSTAR2009, Beijing
arxiv created 2009/09/12 · openalex publication_date 2009/12/01 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The unitary isobar model MAID2007 has been used to analyze the recent data of pion electroproduction. The model contains all four-star resonances in the region below W = 2 GeV and both single- Q 2 and Q 2 dependent transition form factors could be obtained for the Delta, Roper, D 13 (1520), S 11 (1535), S 31 (1620), S 11 (1650), D 15 (1675), F 15 (1680) and P 13 (1720). From the complete world data base, including also π − data on the neutron, also Q 2 dependent neutron form factors are obtained. For all transition form factors we also give convenient numerical parameterizations that can be used in other reactions. Furthermore, we show how the transition form factors can be used to obtain empirical transverse charge densities and our first results are given for the Roper, the S 11 and D 13 resonances.