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  • Open Access

Parton distributions from boosted fields in the Coulomb gauge

Xiang Gao1, Wei-Yang Liu2, and Yong Zhao1

  • 1Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 2Center for Nuclear Theory, Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794–3800, USA

Phys. Rev. D 109, 094506 – Published 10 May, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.094506

Abstract

We propose a new method to calculate parton distribution functions (PDFs) from lattice correlations of boosted quarks and gluons in the Coulomb gauge. Compared to the widely used gauge-invariant Wilson-line operators, these correlations greatly simplify the renormalization thanks to the absence of linear power divergence. Additionally, they enable access to larger off-axis momenta under preserved 3D rotational symmetry, as well as enhanced long-range precision that facilitates the Fourier transform. We verify the factorization formula that relates this new observable to the quark PDF at one-loop order in perturbation theory. Moreover, through a lattice calculation of the pion valence quark PDF, we demonstrate the aforementioned advantage and features of the Coulomb gauge correlation and show that it yields consistent results with the gauge-invariant method. This opens the door to a more efficient way to calculate parton physics on the lattice.

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