Abstract
Eta photo- and electroproduction on the nucleon is studied using an isobar model. The model contains Born terms, and contributions from vector-meson exchanges and nucleon resonances. Our results are compared with recent eta-photoproduction data for differential and total cross sections, beam asymmetry, and target asymmetry, as well as electroproduction data. Besides the dominant S 11(1535) resonance, we show that the second S 11 resonance, S 11(1650), is also necessary to be included in order to extract S 11(1535) resonance parameters properly. In addition, the beam asymmetry data allow us to extract very small (<0.1%) N ∗→ηN decay branching ratios of the D 13(1520) and F 15(1680) resonances because of the overwhelming s-wave dominance. This model (ETA-MAID) is implemented as a part of the MAID program (the MAID program can be accessed from the webpage: http://www.kph.uni-mainz.de/MAID/maid.html).
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