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8 - Quantum Chromodynamics

Published online by Cambridge University Press:  31 August 2023

Pascal Paganini
Affiliation:
École Polytechnique, Paris
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Summary

This chapter is divided into two parts. The first part introduces the quark model, following more or less the historical developments. It led to an approximate symmetry, based on the SU(3) flavour group, where u, d and s quarks are the three degrees of freedom. The second part introduces the quantum chromodynamics theory (QCD), i.e. the true formal gauge theory of the strong interaction. Here again, the symmetry group is SU(3), but the degrees of freedom are the three quark colours. This symmetry is assumed to be exact, which has consequences on the existence of gluons and their properties, the carriers of the strong interaction at the elementary particle level, briefly mentioned in the previous chapter. The QCD interaction is the first non-Abelian interaction encountered in the book. The non-perturbative regime of QCD is also presented with a short introduction to lattice QCD. A discussion about the colour confinement and the hadronisation of quarks is also given.

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Chapter
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Fundamentals of Particle Physics
Understanding the Standard Model
, pp. 249 - 328
Publisher: Cambridge University Press
Print publication year: 2023

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  • Quantum Chromodynamics
  • Pascal Paganini, École Polytechnique, Paris
  • Book: Fundamentals of Particle Physics
  • Online publication: 31 August 2023
  • Chapter DOI: https://doi.org/10.1017/9781009171595.009
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  • Quantum Chromodynamics
  • Pascal Paganini, École Polytechnique, Paris
  • Book: Fundamentals of Particle Physics
  • Online publication: 31 August 2023
  • Chapter DOI: https://doi.org/10.1017/9781009171595.009
Available formats
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Save book to Google Drive

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.

  • Quantum Chromodynamics
  • Pascal Paganini, École Polytechnique, Paris
  • Book: Fundamentals of Particle Physics
  • Online publication: 31 August 2023
  • Chapter DOI: https://doi.org/10.1017/9781009171595.009
Available formats
×