Model independent analysis of polarization effects in elastic   proton-electron scattering
  The experimental observables for the elastic reaction induced by protons on electrons are calculated in the Born approximation. Model independent expressions are derived for the differential cross section and polarization observables. Numerical estimations are given for spin correlation coefficients, polarization transfer coefficients and depolarization coefficients, in a wide kinematical range. Specific attention is given to the kinematical conditions, i.e., to the specific range of incident energy and transferred momentum. 
G. I. Gakh, A. Dbeyssi, D. Marchand, E. Tomasi Gustafsson, V. V. Bytev
nucl-th hep-ph