Abstract
The cross sections of the reaction ep → e′p′π+π− for small photon virtualities were measured on a CEBAF large acceptance spectrometer (CLAS detector) at the Thomas Jefferson National Accelerator Facility for the first time. A complete set of one-dimensional cross sections of the reaction was obtained for photon virtualities in the range 0.2 GeV2 < Q2 < 0.6 GeV2 and invariant masses of the final hadronic system in the range 1.3 GeV < W < 1.6 GeV. A preliminary analysis of the obtained data in the framework of the phenomenological model demonstrated that the Q2 dependence of the electromagnetic form factors for the P11 (1440) and D13 (1520) resonances can be determined in the kinematic region (which is the most sensitive to the contribution from the meson cloud) and that the axial transition form factor p → Δ can be derived.
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