2004/07/31 by I.G. Aznauryan, I. G. Aznauryan, V. D. Burkert +6 · 11 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.71.015201
published as Phys.Rev.C71:015201,2005 · 9 pages, 9 figures
arxiv created 2004/12/21 · openalex publication_date 2005/01/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using two approaches---dispersion relations and the isobar model---we have analyzed recent high precision CLAS data on cross sections of \ensuremathπ0, \ensuremathπ+, and \ensuremathη electroproduction on protons, and the longitudinally polarized electron beam asymmetry for p(\stackrel\ensuremath→e,e'p)\ensuremathπ0 and p(\stackrel\ensuremath→e,e'n)\ensuremathπ+. The contributions of the resonances P33(1232), P11(1440), D13(1520), and S11(1535) to \ensuremathπ electroproduction and of S11(1535) to \ensuremathη electroproduction are found. The results obtained using the two approaches are in good agreement. There is also good agreement between amplitudes of the \ensuremathγ*N\ensuremath→S11(1535) transition found in \ensuremathπ and \ensuremathη electroproduction. For the first time accurate results are obtained for the longitudinal amplitudes of the P11(1440), D13(1520), and S11(1535) electroexcitations on protons. A strong longitudinal response is found for the Roper resonance, which rules out presentation of this resonance as a hybrid state.