Kinematics of Current Region Fragmentation in Semi-Inclusive Deeply Inelastic Scattering

Understand

Different kinematical regimes of semi-inclusive deeply inelastic scattering (SIDIS) processes correspond to different underlying partonic pictures, and it is important to understand the transition between them.

• This is particularly the case when there is sensitivity to intrinsic transverse momentum, in which case kinematical details can become especially important.
• We address the question of how to identify the current fragmentation region --- the kinematical regime where a factorization picture with fragmentation functions is appropriate.
• We distinguish this from soft and target fragmentation regimes.