ИСТИНА

The measurements of exclusive π+n and π0p electroproduction with the CLAS detector in Hall B at Jlab provided the dominant part of the world data on observables of these channels stored in the CLAS Physics Data Base. The data on exclusive Nπ and π+π−p electroproduction are the major source of the information on nucleon resonance (N∗) electroexcitation amplitudes. They offer insight into the N∗ structure and strong QCD dynamics which underlie the nucleon resonance generation from quarks and gluons. The approach for evaluation of the four-fold Nπ differential cross sections and unpolarized, transverse-transverse, longitudinal-transverse exclusive structure functions will be presented in the talk. The estimates of Nπ electroproduction observables have become available from the measured with the CLAS detector differential cross sections for the first time. They cover a broad kinematics area of the invariant masses of the final hadron system of W < 1.7 GeV and the photon virtuality range Q2 < 5.0 GeV2. The estimated Nπ cross sections and exclusive structure functions are of particular importance both in the studies of the N∗ structure in 1-dimension and in exploration of the ground nucleon structure in 3 dimesions from the results on the chiral-odd generalized parton distributions constrained by the data of deeply virtual Nπ electroproduction.