Nucleon Structure and Spin Effects in Elastic Hadron Scattering

Soft diffraction phenomena in elastic nucleon scattering are considered from the viewpoint of the spin dependence of the interaction potential. Spin-dependent pomeron effects are analyzed for elastic pp scattering, and spin-dependent differential cross sections and spin correlation parameters are calculated. The spin correlation parameter AN is examined on the basis of experimental data from s=4.9 GeV up to 23.4GeV in the framework of the extended High Energy Generalized Structure (HEGS) model. It is shown that the existing experimental data of proton-proton and proton-antiproton elastic scattering at high energy in the region of the diffraction minimum and at large momentum transfer give the support of the existence of the energy-independent part of the hadron spin flip amplitude.

The effect of vacuum polarization on muon–proton scattering at small energies and angles

We give a compact expression for the unpolarized differential cross section for muon–proton scattering in the one-photon exchange approximation. The effect of adding the vacuum polarization amplitude to the no-spin-flip amplitude for one-photon exchange is calculated at small energies and scattering angles and is found to be negligible for present experiments. PACS No.: 13.6