Global QCD Analysis of Polarized Semi-Inclusive DIS Data and Fragmentation Functions

Fragmentation functions (FFs) which are beyond the perturbative description give information on parton fragmentation processes. The fragmentation functions can be extracted from the world data of e+e- hadron production in the framework of perturbative QCD. FFs become important elements in analyses of high energy interactions with hadron production, like Semi-Inclusive Deep Inelastic Scattering (SIDIS). However, the errors of FFs had not been estimated. By performing pQCD fit to e+e- experimental data, we estimated the errors of FFs, especially focusing on widely used Kretzer fragmentation functions. By applying those results, we also investigated the effects of the errors of FFs on the analysis of SIDIS process