The Gluon Anomaly in the Proton Spin

  • Jeffrey E. Mandula
Part of the NATO ASI Series book series (NSSB, volume 255)


In this lecture, we will review an important experiment on polarized muon-proton scattering carried out by the European Muon Collaboration (EMC)1) and some theoretical developments that resulted from it.2) The EMC measurement of the spin structure of deep inelastic muon scattering from protons was interpreted as indicating that essentially none of the proton’s spin was carried by the spins of its quarks. A reexamination of this interpretation held that the apparent vanishing of the quark spin contribution could be due to a cancellation between an intrinsic quark contribution and a gluonic contribution induced by the triangle diagram that gives rise to the Adler-BellJackiw anomaly.


Gauge Transformation Quark Propagator Triangle Diagram Polarization Asymmetry Quark Spin 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Jeffrey E. Mandula
    • 1
  1. 1.Department of EnergyDivision of High Energy PhysicsUSA

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