New cross sections for the reaction ep -> e'eta p are reported for total center-of-mass energy W=1.5-2.3 GeV and invariant squared momentum transfer Q(2)=0.13-3.3 GeV2. This large kinematic range allows the extraction of new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. A sharp structure is seen at W similar to 1.7 GeV. The shape of the differential cross section is indicative of the presence of a P-wave resonance that persists to high Q(2). Improved values are derived for the photocoupling amplitude for the S-11(1535) resonance. The new data greatly expand the Q(2) range covered, and an interpretation of all data with a consistent parametrization is provided.

Q*2 DEPENDENCE OF THE S(11)(1535) PHOTOCOUPLING AND EVIDENCE FOR A P-WAVE RESONANCE IN ETA ELECTROPRODUCTION

CORVISIERO, PIETRO;RICCO, GIOVANNI;TAIUTI, MAURO GINO;
2007

Abstract

New cross sections for the reaction ep -> e'eta p are reported for total center-of-mass energy W=1.5-2.3 GeV and invariant squared momentum transfer Q(2)=0.13-3.3 GeV2. This large kinematic range allows the extraction of new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. A sharp structure is seen at W similar to 1.7 GeV. The shape of the differential cross section is indicative of the presence of a P-wave resonance that persists to high Q(2). Improved values are derived for the photocoupling amplitude for the S-11(1535) resonance. The new data greatly expand the Q(2) range covered, and an interpretation of all data with a consistent parametrization is provided.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/226295
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