New cross sections for the reaction ep→epη 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 ηN coupling strengths of baryon resonances. Newly observed structure at W∼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.
The ep →e′pη Reaction at and above the S11(1535) Baryon Resonance
CORVISIERO, PIETRO;RICCO, GIOVANNI;TAIUTI, MAURO GINO;
2001-01-01
Abstract
New cross sections for the reaction ep→epη 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 ηN coupling strengths of baryon resonances. Newly observed structure at W∼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.File in questo prodotto:
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