Two Topics in Quantum Chromodynamics

  • J. D. Bjorken
Part of the NATO ASI Series book series (NSSB, volume 223)


Quantum chromodynamics (QCD) has reached a level of credibility and maturity which deserves textbook status. Indeed, textbooks exist1 and others are on the way.2 Nevertheless, to my mind a textbook treatment of QCD is made much more difficult than that of quantum electrodynamics (QED) because of the confinement problem. Even perturbative QCD—which is all that will really be discussed here—suffers this problem. There is no S-matrix theory of quarks and gluons as there is for QED, as given in the LSZ formalism.3 The concept of “on-mass-shell” or “asymptotic” quark and/or gluon is highly suspect. And the typical “Feynman diagram” used in perturbative QCD contains internal quark and gluon lines and external hadron lines. What does that really mean? How does one derive and justify Feynman-rules for such amplitudes in the absence of good control over the confinement question?


Structure Function Quantum Chromo Dynamic Perturbation Series Absorptive Part Current Correlation Function 
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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • J. D. Bjorken
    • 1
  1. 1.Stanford Linear Accelerator CenterStanford UniversityStanfordUSA

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