Twist-3 Contributions in Semi-Inclusive DIS in the Target Fragmentation Region

TL;DR

This paper calculates twist-3 contributions to hadron production in the target fragmentation region of semi-inclusive deep inelastic scattering, emphasizing gauge invariance and fracture functions.

Contribution

It provides the complete twist-3 results for structure functions and asymmetries, ensuring gauge invariance through collinear expansion and fracture functions.

Findings

Gauge-invariant expression of the hadronic tensor

Explicit formulas for structure functions and asymmetries

Enhanced understanding of nonperturbative effects in target fragmentation

Abstract

We present the complete results up to twist-3 for hadron production in the target fragmentation region of semi-inclusive deep inelastic scattering with a polarized lepton beam and polarized nucleon target. The nonperturbative effects are factorized into fracture functions. The calculation up to twist-3 is nontrivial since one has to keep gauge invariance. By applying collinear expansion, we show that the hadronic tensor can be expressed by gauge-invariant fracture functions. We also present the results for the structure functions and azimuthal asymmetries.