First-Principles Determination of the QCD Contribution to the Axion-Photon Coupling Using Domain-Wall Fermions

Tian Lin, Hao-Yang Cheng, Xu Feng +3

The axion-photon coupling, crucial for experimental axion searches and tests of the strong CP solution, receives a substantial model-independent contribution ${\mathcal{C}}_{\mathrm{QCD}}$…