Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-07-06
Phys.Rev.C71:015201,2005
Physics
Nuclear Physics
Nuclear Theory
9 pages, 9 figures
Scientific paper
10.1103/PhysRevC.71.015201
Using two approaches: dispersion relations and isobar model, we have analyzed recent high precision CLAS data on cross sections of \pi^0, \pi^+, and \eta electroproduction on protons, and the longitudinally polarized electron beam asymmetry for p(\vec{e},e'p)\pi^0 and p(\vec{e},e'n)\pi^+. The contributions of the resonances P33(1232), P11(1440), D13(1520), S11(1535) to \pi electroproduction and S11(1535) to \eta electroproduction are found. The results obtained in the two approaches are in good agreement with each other. There is also good agreement between amplitudes of the \gamma^* N \to S11(1535) transition found in \pi and \eta electroproduction. For the first time accurate results are obtained for the longitudinal amplitudes of the P11(1440), D13(1520) and S11(1535) electroexcitation on protons.
Aznauryan Inna G.
Burkert Volker D.
Egiyan Hovanes
Joo Kyungseon
Minehart Ralph
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