Small-instanton contributions can dominate the QCD axion potential in KSVZ models with many vector-like quarks, raising m_a to tens of MeV and shifting the m_a-g_aγγ relation.
Light Pseudoscalars, Particle Physics and Cosmology,
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Small-instanton effects in an atlas of KSVZ axion models
Small-instanton contributions can dominate the QCD axion potential in KSVZ models with many vector-like quarks, raising m_a to tens of MeV and shifting the m_a-g_aγγ relation.