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We present a detailed analysis of rho(0) electroproduction at intermediateenergy for quasi-elastic knockout kinematics. The approach is based on aneffective Lagrangian which generates exchanges of scalar, pseudoscalar,axial-vector and tensor mesons. The specific role of mesons with differentvalues for J(PC) is analyzed. We show that the pi(0) exchange amplitude and itsinterference terms with eta(eta') and f1 exchanges dominate in the transversepart of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1spin transition when coupling the virtual photons to the nucleon. In contrast,the longitudinal cross section sigmaL is generated by a series of scalar mesonexchanges. To extract the dominant term more detailed information on the innerstructure of scalar mesons is required. It turns out that recent data of theCLAS Collaboration on sigmaL and sigmaT can be described with reasonableaccuracy if one proposes the quarkonium structure for the heavy scalar mesons(M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt anddsigmaT/dt are calculated and compared with the latest CLAS data.

Quasielastic rho0 electroproduction on the proton at intermediate energy: Role of scalar and pseudoscalar meson exchange