PolarizedΛ-Baryon Production inppCollisions

Abstract
We study the production of longitudinally polarized Λ baryons in single-spin pp collisions at BNL RHIC and DESY HERA- N as a means of determining the spin-dependent Λ fragmentation functions. It is shown that a measurement of the rapidity distribution of the Λ's would provide an excellent way of clearly discriminating between various recently suggested sets of polarized Λ fragmentation functions that are all compatible with present e+e data. We also address the main theoretical uncertainties, which appear to be well under control.
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