Preprint
Sep 2026
First-Principles Determination of the QCD Contribution to the Axion-Photon Coupling Using Domain-Wall Fermions
The axion-photon coupling, crucial for experimental axion searches and tests of the strong CP solution, receives a substantial model-independent contribution $\mathcal C_{\rm QCD}$ from QCD dynamics. Next-to-leading-order chiral perturbation theory (NLO ChPT) in different frameworks has yielded puzzling discrepancies o...
Tian Lin, Hao-Yang Cheng, Xu Feng et al.
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