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from Part III - Strong Interaction
Published online by Cambridge University Press: 06 February 2025
We stay in the framework of the low-energy effective theory of QCD in terms of Nambu–Goldstone bosons fields and consider effects due to their topology. We distinguish the cases of Nf = 2 or Nf >= 3 light quark flavors and discuss in both cases how the gauge anomaly cancelation is manifest in the effective theory, the role of G-parity, and the neutral pion decay into two photons, which does not explicitly depend on the number of colors, Nc . For Nf >= 3 we introduce the Wess–Zumino–Novikov–Witten term in a 5th dimension, we discuss the intrinsic parity of light meson fields and their electromagnetic interactions. In this context, we clarify the question whether there is low-energy evidence for Nc = 3, and we address again the role of technicolor.
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