DAPNIA-05-293 |
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General analysis of polarization phenomena in $ e^++e^-\rightarrow N+\bar N$ |
G. I. Gakh, E. Tomasi-Gustafsson |
General properties of the differential cross section and of the polarization observables are derived for the $e^++e^-\\rightarrow N+\\bar N$ reaction, in presence of two--photon exchange. Polarization effects are investigated for longitudinally polarized electron and polarized antinucleon and/or polarized nucleon in the final state. The single--spin asymmetry induced by the transverse polarization of the electron beam is also discussed. |