Leading neutrons from polarized pp collisions

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Kopeliovich, B. Z.
Potashnikova, I. K.
Schmidt, Ivan
Soffer, J.
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We calculate the cross section and single-spin azimuthal asymmetry, A_n(t) for inclusive neutron production in pp collisions at forward rapidities relative to the polarized proton. Absorptive corrections to the pion pole generate a relative phase between the spin-flip and non-flip amplitudes, which leads to an appreciable spin asymmetry. However, the asymmetry observed recently in the PHENIX experiment at RHIC at very small |t|~0.01GeV^2 cannot be explained by this mechanism.
Comment: 8 pages, 6 figures. Based on invited talks presented by B.K. at "Trueman Fest" at BNL, May 12, 2008, and at "Sixth International Conference on Perspectives in Hadronic Physics", ICTP, Trieste, May 12-16, 2008
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High Energy Physics - Phenomenology
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