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A review is presented of polarization experiments in proton storage rings. Efforts to investigate narrow structures in pp scattering Cdibaryon resonances") by means of stored polarized beams are discussed. Tests of an internal polarized hydrogen gas target at the Heidelberg TSR, and demonstration of
For the CELSIUS/WASA Collaboration 1
An important goal of the COMPASS experiment is the study of semi-inclusive polarised muon scattering from a polarised target. The identification of the hadrons will allow, for the first time, a direct measurement of the gluon polarisation AG/G from the cross-section asymmetry of open charm productio
The recently approved COMPASS experiment attempts a measurement of the gluon polarization around r/\_\_ 0.1 with a precision of 5(Ag/g) ,,o 0.1. The experiment uses open charm muo-production and large PT ha&on pairs to tag the photon-gluon fusion process. COMPASS will also cover a rich spin-physics