Beschreibung:
The quasi-PDF approach, proposed by X. Ji in 2013, has made itpossible to directly extract light-cone PDFs from lattice QCD. Thisapproach relies on the extraction of matrix elements of space-likeoperators for fast-moving hadrons. Quasi-PDFs can be related to thelight-cone PDFs through a perturbatively calculable matchingcoefficient. We explore the formalism of matching, for the very firsttime, for the twist-3 PDFs g_{T}(x)gT(x),e(x)e(x)and h_{L}(x)hL(x).In this work, we address the non-trivialities involved in the extractionof the matching coefficient due to the presence of (singular) zero-modecontributions.