Using the model that the baryons are composed of quarks with harmonic interactions, we compute cross-sections for high energy neutrinos and electrons to excite the nucleon to the resonance states with masses below 1.9 GeV. The frame dependence of the nonrelativistic quark model results is emphasized and discrepancies between some previous model calculations of electroproduction form factors and...

Measurements of the power-law corrections to Bjorken scaling and the behavior of structure functions in the highly stressed xbj → 1 regime of electroproduction can lead to new information on the quark-quark correlations controlling the nucleon wavefunction at far-off-shell kinematics. Electroproduction on nuclei at A > xbj > 1 are sensitive to hidden-color components of the nuclear wavefunction...

We generalize the sum rules for the nucleon electric plus magnetic polarizability Σ = α + β and for the nucleon spin-polarizability γ, to virtual photons with Q2 > 0. The dominant low energy cross sections are represented in our calculation by one-pionloop graphs of relativistic baryon chiral perturbation theory and the ∆(1232)-resonance excitation. For the proton we find good agreement of the ...

We present a calculation of single pion electroproduction cross sections on heavy targets in the kinematic region of the ∆(1232) resonance. Final state interactions of the pions are taken into account using the pion multiple scattering model of Adler, Nussinov and Paschos (ANP model). For electroproduction and neutral current reactions we obtain results for carbon, oxygen, argon and iron target...

Data on the nucleon spin structure suggests that the u (and d) quark distributions in the Λ hyperon may be polarized. If this correlation carries over into fragmentation, then the study of polarized Λ's in the current fragmentation region of deep inelastic lepton scattering will be a sensitive probe of nucleon spin structure. Λ production by polarized electrons from unpolarized targets can sear...

We outline in detail the properties of generalized parton distributions (GPDs), which contain new information on the structure of the nucleon and which enter the description of hard exclusive reactions. We highlight the physics content of the GPDs and discuss the quark GPDs in the large Nc limit and within the context of the chiral quark-soliton model. Guided by this physics, we then present a ...

Pion photo-and electroproduction has been studied at threshold and in the resonance region below W < 2 GeV. At threshold π 0 production can be very well explained within a dynamical model derived from an effective chiral Lagrangian. The final state interaction is nearly saturated by single charge exchange rescattering. In the resonance region new electroproduction data at Q 2 = 1 GeV 2 has been...