Abstract
Let us first deal with mesons made of the three lightest quarks u, d, s and \(\overline {u}\), \(\overline {d}\), \(\overline {s}\). As illustrated in Fig. 2.1, with three flavours and three antiflavours one can construct a nonet of mesons for each orbital mode, each vibrational mode and for each parallel and antiparallel spin.
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Notes
- 1.
A reason often invoked is that boson masses enter quadratically in the Klein-Gordon wave equation. Squared masses also appear in chiral perturbation theories.
- 2.
Note that the Landau-Yang theorem also forbids the decay of 3− mesons into two gluons, as well as all odd spin negative parity mesons (Appendix A).
References
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Amsler, C. (2018). Quark-Antiquark Nonets. In: The Quark Structure of Hadrons. Lecture Notes in Physics, vol 949. Springer, Cham. https://doi.org/10.1007/978-3-319-98527-5_5
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DOI: https://doi.org/10.1007/978-3-319-98527-5_5
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