Some more remarks on the Witten-Veneziano formula for the $\eta'$ mass
Erhard Seiler
TL;DR
This paper examines the complexities and recent developments in establishing a solid theoretical foundation for the Witten-Veneziano formula related to the $ ext{η'}$ meson mass.
Contribution
It highlights subtle issues and clarifies the theoretical underpinnings of the Witten-Veneziano formula in light of new research.
Findings
Identifies key subtleties affecting the formula's validity
Provides insights into the theoretical assumptions involved
Suggests directions for future rigorous proofs
Abstract
We discuss some subtleties in connection with the new attempts to provide a firm basis for ths Witten-Veneziano formula.
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