Kavli Affiliate: Hitoshi Murayama
| First 5 Authors: Dan Kondo, Robert McGehee, Tom Melia, Hitoshi Murayama,
| Summary:
We present a model of self-interacting dark matter based on QCD-like theories
and inspired by the proximity of $a_0(980pm 20)$ to the $Kbar{K}(990)$
threshold. Dark matter is comprised of dark pions which self-scatter via the
$sigma$ resonance close to the $pipi$ threshold. While the linear sigma
model serves as a qualitative guide, a fully unitary description of the
scattering in the strongly coupled regime is given by effective range theory.
The introduction of a kinetically mixed dark photon allows the dark pion to
either freeze-out or -in. We study the viable parameter space which explains
the observed relic abundance while evading all current constraints. Searches
for dark matter self interactions at different scales, (in)direct detection
signals, and (in)visibly-decaying dark photons will test this model in the near
future.
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