  A polarized antiproton beam at the Facility for Antiproton and Ion Research,
proposed by the PAX collaboration, will open a window to new physics uniquely
accessible at the new High Energy Storage Ring. Our proposal to realize an
asymmetric collider, in which polarized protons with momenta of about 3.5 GeV/c
collide with polarized antiprotons with momenta up to 15 GeV/c, is well--suited
to perform a direct measurement of the transversity distribution function
$h_1$. In this report we summarize the outcome of various working group
meetings within the PAX collaboration. The overall machine setup at the HESR,
proposed by the PAX collaboration, is described along with the associated PAX
experimental program.
