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The ep -->e'p eta reaction at and above the S11(1535) baryon resonance
R Thompson1, S Dytman, K Y Kim
1Department of Physics and Astronomy, University of Pittsburgh, Pennsylvania 15260, USA.
Physical Review Letters
|April 6, 2001
Abstract:
New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.