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Apr 13 – 16, 2021
US/Eastern timezone

Parton Pseudo-Distributions From Lattice QCD via Distillation

Apr 13, 2021, 3:50 PM
20m

Speaker

Colin Egerer (William and Mary)

Description

The pseudo-distribution formalism is one such lattice methodology capable of extracting light-cone distributions from matrix elements of suitably constructed Euclidean non-local operators of a spacelike extent. Leveraging the distillation spatial smearing program, we extract the unpolarized isovector valence quark PDF of the nucleon via a direct 1-loop matching of the computed Ioffe-time pseudo-distribution and model PDFs. We benchmark the efficacy and systematics inherent to this choice by also extracting the PDF from the matched light-cone Ioffe-time distribution. The tempering of excited-states and improved spatial sampling afforded by distillation lead to higher-quality Ioffe-time distributions relative to the literature, thereby bolstering confidence in extracted PDFs; comparisons with several phenomenological determinations are also made. Prospects of the pseudo-distribution paradigm when applied to the off-forward case will be discussed.

Primary authors

Colin Egerer (William and Mary) Christos Kallidonis (Jefferson Lab) Savvas Zafeiropoulos (CNRS, Aix-Marseille-Université et Université de Toulon)

Co-authors

Kostas Orginos (William and Mary / JLab) Anatoly Radyushkin (ODU/JLab) David Richards (Jefferson Lab)

Presentation materials