• 2 October 2002
Abstract
The fragmentation of an unpolarized quark into a transversely polarized spin-1/2 particle is studied in the framework of a simple model which, in particular, describes the gluon exchange incorporated in the gauge link of the fragmentation function. The transverse single spin asymmetries in $e^+ e^-$ annihilation and semi-inclusive deep-inelastic scattering are calculated in the one-loop approximation. For $e^+ e^-$ annihilation one finds a cancellation between contributions from two on-shell intermediate states, which have no counterpart in deep-inelastic scattering. As a consequence of this cancellation, the model predicts the same spin asymmetry for both processes implying that, in the one-loop approximation, the corresponding fragmentation function is universal.

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