Abstract
We suggest that the large single spin asymmetries observed at high momentum fractions xF and transverse momenta k⊥ of the pion in p↑p → π(xF, k⊥) + X arise from the coherence of the soft interactions with the hard parton scattering process. Such coherence can be maintained if xF → 1 as k⊥ → ∞, while k2⊥(1-xF) ~ λ2QCD stays fixed. Analogous coherence effects have been seen experimentally in the Drell-Yan process at high xF. We find that the p↑p → πX production amplitudes have large dynamic phases and that helicity flip contributions are unsuppressed in this limit, giving rise to potentially large single spin asymmetries.
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