4.7 Article

Monopole and quadrupole contributions to the angular momentum density

期刊

PHYSICS LETTERS B
卷 796, 期 -, 页码 47-51

出版社

ELSEVIER
DOI: 10.1016/j.physletb.2019.07.033

关键词

Nucleon structure; Angular momentum; Energy momentum tensor form factors

资金

  1. National Science Foundation [1812423]
  2. U.S. Department of Energy [DE-FG02-04ER41309]
  3. U.S. Department of Energy (DOE) [DE-FG02-04ER41309] Funding Source: U.S. Department of Energy (DOE)

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The energy-momentum tensor form factors contain a wealth of information about the nucleon. It is insightful to visualize this information in terms of 3D or 2D densities related by Fourier transformations to the form factors. The densities associated with the angular momentum distribution were recently shown to receive monopole and quadrupole contributions. We show that these two contributions are uniquely related to each other. The quadrupole contribution can be viewed as induced by the monopole contribution, and contains no independent information. Both contributions however play important roles for the visualization of the angular momentum density. (C) 2019 The Author(s). Published by Elsevier B.V.

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