The high-energy hadron spin-flip amplitude at small momentum transfer and new AN data from RHIC

Details The high-energy hadron spin-flip amplitude at small momentum transfer and new AN data from RHIC The high-energy hadron spin-flip amplitude at small momentum transfer and new AN data from RHIC

2004-01-08

arxiv.org/abs/hep-ph/0401040v2

Eur.Phys.J.A21:479-486,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures, a few typos fixed in v. 2

Scientific paper

10.1140/epja/i2004-10012-2

In the case of elastic high-energy hadron-hadron scattering, the impact of the large-distance contributions on the behaviour of the slopes of the spin-non-flip and of the spin-flip 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.

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