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6 - Theorizations of scaling

Published online by Cambridge University Press:  06 December 2010

Tian Yu Cao
Affiliation:
Boston University
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Summary

The experimental confirmation of the approximate scaling from SLAC stimulated intensive theoretical activities for conceptualizing the observed short-distance behavior of hadron currents and for developing a self-consistent theory of strong interactions, starting from and constrained by the observed scaling. At first, the most prominent among these efforts was the parton model that was originated from Bjorken's thinking on deep inelastic scattering and Feynman's speculations on hadron–hadron collision, and made popular by Feynman's influential advocacy.

The assumption adopted by the parton model that the short-distance behavior of hadron currents should be described by free field theory, however, was immediately challenged once the scaling results were published. The theoretical framework the challengers used was the renormalized perturbation theory. Detailed studies of renormalization effects on the behavior of currents, by Adler and many others, reinforced the conviction about the limitations of formal manipulations in the PCAC and current algebra reasoning, which made these physical effects theoretically invisible, and discovered, first, the chiral anomaly and, then, the logarithmic violation of scaling. The theoretically rigorous argument for scaling violation was soon to be incorporated into the notion of broken scale invariance by Kenneth G. Wilson, Curtis Callan, and others, which was taken to be the foundation of such approaches as Wilson's operator product expansion and Callan's scaling law version of the renormalization group equation for conceptualizing the short-distance behavior of hadron currents, for giving a more detailed picture of these behaviors than current algebra could offer, and even for a general theory of strong interactions.

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From Current Algebra to Quantum Chromodynamics
A Case for Structural Realism
, pp. 106 - 132
Publisher: Cambridge University Press
Print publication year: 2010

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  • Theorizations of scaling
  • Tian Yu Cao, Boston University
  • Book: From Current Algebra to Quantum Chromodynamics
  • Online publication: 06 December 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511781759.007
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  • Theorizations of scaling
  • Tian Yu Cao, Boston University
  • Book: From Current Algebra to Quantum Chromodynamics
  • Online publication: 06 December 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511781759.007
Available formats
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To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Theorizations of scaling
  • Tian Yu Cao, Boston University
  • Book: From Current Algebra to Quantum Chromodynamics
  • Online publication: 06 December 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511781759.007
Available formats
×