Introduction to Quark Model

  • Harald Fritzsch
Part of the Classic Texts in the Sciences book series (CTS)


The fundamental representation of the isospin group SU(2) is the doublet representation. The proton and the neutron are described by a doublet. The fundamental representation of SU(3) is the triplet representation, but in nature there are no hadrons, which transform as a triplet—the hadrons are described only by singlets, octets and decuplets. This feature of the SU(3) symmetry was not understood until 1964.

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Harald Fritzsch
    • 1
  1. 1.Physik-DepartmentLudwig-Maximilians-UniversitätMünchenGermany

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