Quark model approach to the η meson electroproduction on the proton

A recently developed quark model approach to pseudoscalar meson photoproduction is extended to the electroproduction process for the η meson in the kinematics of momentum transfer Q2 ≤ 4 (GeV/c)2 and total centre of mass energy W ≤ 1.6 GeV. Existing data are well reproduced and the roles of the S11 (1535) and D13 (1520) resonances are closely investigated. In the study of the longitudinal excitation of the S11 (1535) resonance, a reliable constraint on the S11 (1535) properties is obtained by cleanly removing the electromagnetic transition from the γ(v)p → S11 (1535) → ηp amplitude. Thus, the fitted quantities can be determined with an uncertainty of about 15%. This could be the first direct constraint on the S11 (1535) properties in theory.