Fragmentation functions and their role in determining the polarized parton densities

Abstract

We extract the pion fragmentation functions and their uncertainties from a judicious choice of e+e- and semi-inclusive DIS data. These are used to study the error propagation in the extraction of polarized parton densities from semi-inclusive DIS asymmetries. We conclude that the uncertainties on polarized PDs have been underestimated in the past.

Comments: 6 pages, 2 Figures, a talk presented by E. Leader at the X International Workshop on Deep Inelastic Scattering (DIS2002) in Krakow, 2002, Poland