Direct-Channel Resonance Model of Deep-Inelastic Electron Scattering. II. Spin Dependence of the Cross Section

The spin dependence of the cross section of deep-inelastic electron (muon) scattering is investigated in the framework of the direct-channel resonance model. The structure functions entering the spin-dependent part of the cross section obey the following scaling laws in the Bjorken limit: $\nu W_3$ is a function of $\omega$, and $\nu W_4=W_3$. The polarization asymmetry is calculated in the framework of a quark model with orbital excitations; sizable asymmetries are predicted. The spin-dependent part of the cross section is found to be strongly model dependent; therefore, polarized-beam-polarized-target experiments should be able to distinguish between various models.