Target Fragmentation Studies

Semi-inclusive deep-inelastic scattering(SIDIS) is an essential process for probing the nucleon structure in experiments at JLab and future EIC. While most SIDS studies focus on the current fragmentation region, the target fragmentation region(TFR) is relatively little studied. In this talk, I will discuss some recent progresses on the higher-twist effects of SIDIS in TFR. I will first discuss the twist-3/4 factorization of structure functions at low transverse momentum and show that they can be expressed in terms of the collinear fracture functions. The properties of these fracture functions are discussed as well. Then I will turn to the studies of higher-twist effects at large transverse momentum in TFR and discuss the re-factorization of the fracture function. These studies provide insight into the nucleon structure when a hadron is generated from the target remnant.