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This content will become publicly available on February 25, 2015

Title: Justifying the naive partonic sum rule for proton spin

We provide a theoretical basis for understanding the spin structure of the proton in terms of the spin and orbital angular momenta of free quarks and gluons in Feynman’s parton picture. We show that each term in the Jaffe–Manohar spin sum rule can be related to the matrix element of a gauge-invariant, but frame-dependent operator through a matching formula in large-momentum effective field theory. We present all the matching conditions for the spin content at one-loop order in perturbation theory, which provide a basis to calculate parton orbital angular momentum in lattice QCD at leading logarithmic accuracy.
Authors:
 [1] ;  [2] ; ORCiD logo [3]
  1. Shanghai Jiao Tong Univ. (China). INPAC, Dept. of Physics and Astronomy; Peking Univ., Beijing (China). Center for High-Energy Physics; Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics
  2. Shanghai Jiao Tong Univ. (China). INPAC, Dept. of Physics and Astronomy
  3. Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics
Publication Date:
OSTI Identifier:
1228402
Grant/Contract Number:
FG02-93ER-40762; 11DZ2260700; 11175114; 11405104
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 743; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS