Quark and gluon content of the proton spin

Anatoli V. Efremov, Jacques Soffer, and Nils A. Törnqvist
Phys. Rev. D 44, 1369 – Published 1 September 1991
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Abstract

We examine the role of quarks and gluons in polarized deep-inelastic scattering in connection with the famous European Muon Collaboration experimental result. The gluon contribution generated by the axial anomaly is shown to have a well-defined physical meaning and its gauge-invariance properties are fully clarified. We also emphasize the role of the ghost contribution in the generalized Goldberger-Treiman relation and give a detailed calculation of the correction due to unequal quark masses and to π0ηη mixing.

  • Received 27 December 1990

DOI:https://doi.org/10.1103/PhysRevD.44.1369

©1991 American Physical Society

Authors & Affiliations

Anatoli V. Efremov

  • Joint Institute of Nuclear Research, Dubna, Head Post Office, P.O. Box 79, 101000 Moscow, U.S.S.R.

Jacques Soffer

  • Centre National de la Recherche Scientifique, Centre de Physique Theorique, Luminy Case 907, F-13288 Marseille, France

Nils A. Törnqvist

  • University of Helsinki, Research Institute for High Energy Physics, Siltavuorenpenger 20B, SF 00170 Helsinki 17, Finland

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Issue

Vol. 44, Iss. 5 — 1 September 1991

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