The high-energy hadron spin-flip amplitude at small momentum transfer and new AN data from RHIC
نویسندگان
چکیده
In the case of elastic high-energy hadron-hadron scattering, the impact of the largedistance contributions on the behaviour of the slopes of the spin-non-flip and of the spinflip amplitudes is analysed. It is shown that the long tail of the hadronic potential in impact parameter space leads to a value of the slope of the reduced spin-flip amplitude larger than that of the spin-non-flip amplitude. This effect is taken into account in the calculation of the analysing power in proton-nucleus reactions at high energies. It is shown that the preliminary measurement of AN obtained by the E950 Collaboration indeed favour a spin-flip-amplitude with a large slope. Predictions for AN at pL = 250 GeV/c are given. PACS numbers: 13.85.Dz, 13.85.Lg, 13.85.-t
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