Photons possess no magnetic dipole moment as a fundamental consequence of gauge invariance and the Standard Model of particle physics; no citation is needed for this basic physical fact.
The claim that photons possess no magnetic dipole moment is a foundational, axiomatic fact of standard quantum electrodynamics and the Standard Model, where the photon is an uncharged, massless gauge boson. None of the retrieved papers directly address or test this fundamental particle property; instead, they discuss unrelated topics such as axion-photon coupling, condensed matter, and molecular polaritons. Therefore, this is categorized as common knowledge requiring no citation.