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from Part III - Strong Interaction
Published online by Cambridge University Press: 06 February 2025
This chapter reviews the solution to the U(1)A-problem, from a quantitative perspective. We discuss the ‘t Hooft large-Nc limit of QCD, which removes the axial anomaly, and its reappearance under 1/ Nc corrections. This provides mass to the η’ meson, which is related to the topological susceptibility by the Witten–Veneziano formula. This susceptibility is now well-defined on the lattice, based on the index theorem. It has a controlled continuum limit, which substantiates the Witten–Veneziano formula.
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