This file provides information about TWO program items: 
ILCACdiscussion on Jan 27, 2021
ILCACseminar    on Feb 03, 2021

Item 1 -------------------------------------------------------------------

ILCACdiscussion Wednesday, Jan 27 (2021) at 13:30 GMT at ZOOM
https://us02web.zoom.us/j/81572103194?pwd=eE1QVWZFc1hWbWszZ2N0RW1iWHFBZz09

Moderator: Matthias Burkardt, NMSU    
Subject:   Vacuum and zero-modes, continued

Item 2 -------------------------------------------------------------------

ILCACseminar    Wednesday, Feb 03 (2021) at 13:30 GMT at ZOOM
https://us02web.zoom.us/j/81572103194?pwd=eE1QVWZFc1hWbWszZ2N0RW1iWHFBZz09

Speaker: 
Andreas Metz
Temple U.

Title:
Exploring twist-3 PDFs g_T(x), e(x) and h_L(x) 
in lattice QCD using quasi-PDF approach

Abstract:
The quasi-PDF approach, proposed by Ji in 2013, has sparked 
a new wave of interest in extracting PDFs from lattice QCD. 
This approach relies on the extraction of matrix elements of 
fast-moving hadrons coupled to space-like separated quark 
fields. Such auxiliary quantities can be related to the 
light-cone PDFs using a perturbative procedure called matching. 
This procedure has demonstrated success in the extraction of 
the twist-2 PDFs as well as twist-2 GPDs from lattice QCD. 
We explore the formalism of matching, for the first time, 
for the twist-3 PDFs g_T(x), e(x) and h_L(x). Regarding the 
theoretical aspects of such matching-type calculations, we 
make several non-trivial observations, all of which arise 
from the singular zero-mode contributions present in the 
perturbative results of the light-cone and quasi-PDFs. As 
such, we lay the necessary (non-trivial) theoretical foundations 
for dealing with such zero-mode contributions in matching-type 
calculations. From the lattice side, we also present the 
first-ever x-dependent twist-3 results. Finally, we also address 
the validity and the violation of  the Burkhardt-Cottingham-type 
sum rules in perturbative model calculations.

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