Abstract
We point out that the measurement of target spin depolarization D nn in the pp → ΛΛ reaction may test dynamical mechanisms invoked to explain the proton spin puzzle revealed by polarized deep-inelastic scattering experiments. In particular, models with negatively polarized ss pairs in the proton wave function predict D nn < 0, whereas models with positively polarized gluons would predict D nn > 0.
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