The asymmetry A, given by: is proportional to the degree of spin polarization P according to A = SP, where S is the Sherman function.
The Mott cross section formula is the mathematical description of the scattering of a high energy electron beam from an atomic nucleus-sized positively charged point in space.
The equation for the Mott cross section includes an inelastic scattering term to take into account the recoil of the target proton or nucleus.
[1] When an experimentally found diffraction pattern deviates from the mathematically derived Mott scattering, it gives clues as to the size and shape of an atomic nucleus[2][1] The reason is that the Mott cross section assumes only point-particle Coulombic and magnetic interactions between the incoming electrons and the target.
The Born approximation of the diffraction of a beam of electrons by atomic nuclei is an extension of Mott scattering.