Two-loop contributions of axion-like particles to electromagnetic and chromomagnetic form factors
arxiv(2024)
摘要
Axions and axion-like particles emerge in many models for physics beyond the
Standard Model. Thus, they have gained increasing research interest in both
experimental and theoretical physics apart from their original proposition as a
solution to the strong CP-problem. Among other aspects it has recently been
shown that ALPs can potentially provide a solution to the long-lasting
discrepancy between theory and experiment of the anomalous magnetic moment of
the muon. Provided that the ALP has flavor-violating couplings to leptons, they
can also mediate flavor-violating decays like μ→ eγ. Both processes
are mediated through related form factors that we compute to two-loop order. We
further show numerical implications of our calculations and how they might
affect constraints on ALP couplings derived from experiments.
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