Abstract
We measured energy (√s) and transverse momentum (pT) dependence of single-spin asymmetry (AN) of very forward neutron in transversely polarized proton collisions with √s from 62 to 500 GeV. The observed asymmetry linearly increases with pT up to ≃ 0.3 GeV/c. On the other hand, √s dependence, which shows higher asymmetry for higher √s can be interpreted as due to pT dependence. A one-pion exchange model fails to reproduce the data. This suggests that the mechanism for forward neutron prodction is not understood yet, and that we need to consider more processes for forward neutron production.
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