Quark model approach to the $η$ meson electroproduction on the proton

Details Quark model approach to the $η$ meson electroproduction on the proton Quark model approach to the $η$ meson electroproduction on the proton

2000-11-19

arxiv.org/abs/nucl-th/0011069v2

J.Phys.G28:1293-1312,2002

Physics

Nuclear Physics

Nuclear Theory

31 pages, 9 figures; Substantially modified version, to appear on Jour. of Phys. G

Scientific paper

10.1088/0954-3899/28/6/312

A recently developed quark model approach to pseudoscalar meson photoproduction is extended to electroproduction process for the $\eta$ meson in the kinematics of momentum transfer $Q^2 \leq$ 4 (GeV/c)$^2$ and total center of mass energy $W \leq$ 1.6 GeV. Existing data are well reproduced and the roles of the $S_{11}(1535)$ and $D_{13}(1520)$ resonances are closely investigated. In the study of the longitudinal excitation of the $S_{11}(1535)$ resonance, a reliable constraint on the $S_{11}(1535)$ properties is obtained by cleanly removing the electromagnetic transition from the $\gamma_{(v)} p \to S_{11}(1535) \to \eta p$ amplitude. Thus, the fitted quantities can be determined with an uncertainty of about 15%. This could be the first direct constraint on the $S_{11}(1535)$ properties in theory.

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