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See detailNon-perturbative momentum dependence of the coupling constant and hadronic models
Courtoy, Aurore ULg; Scopetta, S.; Vento, V.

in European Physical Journal A -- Hadrons & Nuclei (2011), 47(4), 1-7

Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables in the deep inelastic region. The resolution of Dyson-Schwinger equations ... [more ▼]

Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables in the deep inelastic region. The resolution of Dyson-Schwinger equations leads to the freezing of the QCD running coupling (effective charge) in the infrared, which is best understood as a dynamical generation of a gluon mass function, giving rise to a momentum dependence which is free from infrared divergences. We use this new development to understand why perturbative treatments are working reasonably well despite the smallness of the hadronic scale. © 2011 SIF, Springer-Verlag Berlin Heidelberg. [less ▲]

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See detailHigh-energy hadron spin-flip amplitude at small momentum transfer and new A(N) data from RHIC
Cudell, Jean-René ULg; Predazzi, E.; Selyugin, Oleg Viktorovich

in European Physical Journal A -- Hadrons & Nuclei (2004), 21(3), 479-486

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 ... [more ▼]

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 A(N) (for p 12C obtained by the E950 Collaboration indeed favours a spin-flip amplitude with a large slope. Predictions for A)(N) (at P)(L) = 250 GeV/c are given. [less ▲]

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