Importance of Semi Inclusive DIS Processes in Determining Fragmentation Functions

Understand

A NLO QCD analysis of the HERMES and COMPASS data on pion multiplicities is presented.

• Sets of pion fragmentation functions are extracted from fits to the data and compared with those obtained from other groups before these data were available.
• The consistency between HERMES and COMPASS data is discussed.
• We point out a possible inconsistency between the HERMES [x, z] and [Q^2, z] presentations of their data.