31 July 2023 to 4 August 2023
America/Chicago timezone

Parton Distributions from Boosted Fields in the Coulomb Gauge

1 Aug 2023, 17:40
20m
One West (WH1W)

One West

WH1W

Speaker

Yong Zhao (Argonne National Laboratory)

Description

In this talk, we will discuss a new method to calculate parton distribution functions (PDFs) from correlations of boosted quarks and gluons in the Coulomb gauge.
Compared to the widely used quasi-PDFs defined from gauge-invariant Wilson-line operators, such correlations offer advantages including absence of linear power divergence, enhanced long-range precision, and accessibility to larger off-axis momenta. We verify the validity of this method at next-to-leading order in perturbation theory and use it to calculate the pion valence quark PDF on a lattice with spacing $a=0.06$ fm and valence pion mass $m_\pi=300$ MeV.
Our result agrees with that from the gauge-invariant quasi-PDF at similar precision, achieved with only half the computational cost through a large off-axis momentum $|\vec{p}|\sim2.2$ GeV.

Topical area Structure of Hadrons and Nuclei

Primary authors

Wei-Yang Liu (Stony Brook University) Xiang Gao (Argonne National laboratory) Yong Zhao (Argonne National Laboratory)

Presentation materials