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We present a short overview of the PAX physics case for polarized antiprotons. In order to progress towards a stored polarized antiproton beam, it is crucial to understand the interaction of polarized protons with unpolarized electrons. Therefore, the future investigations which address in particular the contributions of electrons to the polarization buildup of a stored proton beam, are presented here in more detail. The foreseen spin-filtering experiments at COSY-Jülich and at the AD of CERN are briefly discussed as well. [ABSTRACT FROM AUTHOR]

Understanding the interplay of the nuclear interaction with polarized protons and the electromagnetic interaction with polarized electrons in polarized atoms is crucial to progress towards the PAX goal to eventually produce stored polarized antiproton beams at FAIR. Presently, there exist two competing theoretical scenarios: one with substantial spin filtering of (anti)protons by atomic electrons, and a second one suggesting a self-cancellation of the electron contribution to spin filtering. After a brief review of the PAX physics case for polarized antiprotons at FAIR, a detailed discussion of future investigations, including spin-filtering experiments at COSY-Jülich and at the AD of CERN is presented. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]