Heterotic string theory implies the QCD axion mass is bounded below by 0.5 neV and typically falls in [0.5, 0.8] neV across most compactifications.
and Redondo, Javier
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Chiral EFT with meson-ALP mixing yields predictions for branching ratios, invariant-mass distributions, and forward-backward asymmetries in semileptonic tau decays to axion-like particles and mesons.
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Heterotic String Theory Suggests a QCD Axion Near 0.5 neV
Heterotic string theory implies the QCD axion mass is bounded below by 0.5 neV and typically falls in [0.5, 0.8] neV across most compactifications.
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Axion-like particle-meson production in semileptonic $\tau$ decays
Chiral EFT with meson-ALP mixing yields predictions for branching ratios, invariant-mass distributions, and forward-backward asymmetries in semileptonic tau decays to axion-like particles and mesons.