Abstract: In the first part of this talk, we will present the linear divergence extracted from lattice QCD calculations of the Wilson loop, gauge fixed Wilson link, vacuum expectation value and hadron as well as off-shell quark matrix element (RI/MOM) of nonlocal quark biliear operator. Based on the results from a=0.03 fm to 0.12 fm with various valence and sea actions, the linear divergences turn out to be case sensitive, especially in the off-shell, gauge-dependent quark matrixelement. In the second part, some preliminary investigation on this sensitivity will also be discussed.
Speakers: Yi-Bo Yang, Institute of Theoretical Physics, CAS, Beijing;
Jian-Hui Zhang, Beijing Normal University.
Reference: https://arxiv.org/abs/2012.05448, https://arxiv.org/abs/2103.02965 (optional).
Discussion Panel: Jiunn-Wei Chen (National Taiwan University), Krzysztof Cichy (Mickiewicz University, Poznan).