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The Flavor of QCD Axion Dark Matter
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abstract
We argue that demanding a consistent cosmological history, including the absence of domain walls and strongly interacting relics at the Peccei-Quinn scale, singles out two concrete realizations of hadronic QCD axions as viable dark matter models. These realizations generally feature flavor-violating axion couplings to Standard Model quarks that are unsuppressed at low energies. As a consequence, experiments looking for flavor-violating hadronic processes involving the axion can be sensitive probes of QCD axion dark matter models. In particular, we show that the NA62 and KOTO experiments could detect the $K\rightarrow\pi + a$ decay for axions consistent with the observed dark matter abundance via the post-inflationary misalignment mechanism.
Forward citations
Cited by 3 Pith papers
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Using $\Delta N_{\rm eff}$ to constrain preferred axion model dark matter
In preferred axion models with slow heavy-quark decays, axions produced after decoupling form dark radiation that can exceed Planck's ΔNeff bound, excluding much of the parameter space of models D and E.
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Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility
STCF can reach |V_eN|^2 values one to two orders of magnitude below current bounds for heavy neutral leptons via displaced-vertex searches from ALP decays in D-meson production.
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Axion framework with color-mediated Dirac neutrino masses
A KSVZ-type axion framework generates Dirac neutrino masses through colored vector-like quarks and leptoquarks, linking neutrino mass, strong CP, and dark matter.
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