Abstract
In a perturbative QCD approach, with inclusion of spin and transverse momentum effects, experimental data on azimuthal asymmetries observed in polarized semiinclusive deeply inelastic scattering and ${e}^{+}{e}^{\ensuremath{-}}$ annihilations can be used to determine the Sivers, transversity, and Collins soft functions. By using these functions, within the same scheme, we predict ${p}^{\ensuremath{\uparrow}}p\ensuremath{\rightarrow}h+X$ single spin asymmetries in remarkable agreement with high energy experimental data.
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