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An experiment was done using an accelerated polarized proton beam and a polarized proton target. The elastic cross section for proton-proton scattering at 6.0 GeV/c and P_⊥²=0.5-1.6 (GeV/c)² was measured in the spin states {↑} {↑}, {↓} {↓}, and {↑} {↓} perpendicular to the scattering plane. The cross sections were found to be unequal by up to a factor of 2.
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O’Fallon et al. (1974) studied this question.
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