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Journal Article
The flavor of QCD axion dark matter
2023
Overview
A
bstract
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
→
π
+
a
decay for axions consistent with the observed dark matter abundance via the post-inflationary misalignment mechanism.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen
