Axion Dark Matter from Heavy Quarks
arxiv(2024)
摘要
We propose simple scenarios where the observed dark matter abundance arises
from decays and scatterings of heavy quarks through freeze-in of an axion-like
particle with mass in the 10 keV - 1 MeV range. These
models can be tested by future X-ray telescopes, and in some cases will be
almost entirely probed by searches for two-body decays K →π +
invis. at NA62. As a byproduct, we discuss the cancellation of IR
divergencies in flavor-violating scattering processes relevant for thermal
axion production, and derive the general contribution to axion-photon couplings
from all three light quarks.
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