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Peer-reviewedCC BYPhysics Letters B

Quark orbital angular momentum from chiral symmetry breaking in QCD

  • June-Young Kim
  • Ho-Yeon Won
  • Christian Weiss
Open at sourcePDFDOICite

Abstract

The flavor-nonsinglet ( u − d ) quark angular momentum (AM) in the proton is computed based on the effective spin-flavor dynamics emerging from chiral symmetry breaking by QCD instantons. The QCD AM operators are converted to effective spin-flavor operators expressing instanton-induced chiral interactions. A large negative orbital AM L u − d arises from the interactions of the quarks with the chiral mean field in the proton in the large- N c limit. It cancels part of the large positive spin AM S u − d and reduces the total AM J u − d = L u − d + S u − d , in agreement with lattice QCD calculations.

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Cite

BibTeXRIS
BibTeX
@article{kim2026quark,
  title = {{Quark orbital angular momentum from chiral symmetry breaking in QCD}},
  author = {June-Young Kim and Ho-Yeon Won and Christian Weiss},
  journal = {Physics Letters B},
  year = {2026},
  month = sep,
  doi = {10.1016/j.physletb.2026.140980},
  url = {https://hal.science/hal-05767307v1},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Quark orbital angular momentum from chiral symmetry breaking in QCD
AU  - June-Young Kim
AU  - Ho-Yeon Won
AU  - Christian Weiss
PY  - 2026
DA  - 2026/09/28
JO  - Physics Letters B
DO  - 10.1016/j.physletb.2026.140980
UR  - https://hal.science/hal-05767307v1
AB  - The flavor-nonsinglet ( u − d ) quark angular momentum (AM) in the proton is computed based on the effective spin-flavor dynamics emerging from chiral symmetry breaking by QCD instantons. The QCD AM operators are converted to effective spin-flavor operators expressing instanton-induced chiral interactions. A large negative orbital AM L u − d arises from the interactions of the quarks with the chiral mean field in the proton in the large- N c limit. It cancels part of the large positive spin AM S u − d and reduces the total AM J u − d = L u − d + S u − d , in agreement with lattice QCD calculations.
SN  - 0370-2693
SN  - 1873-2445
ER  -