1. Linear sigma dark matter
- Author
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Kondo, Dan, McGehee, Robert, Melia, Tom, and Murayama, Hitoshi
- Subjects
Nuclear and Plasma Physics ,Particle and High Energy Physics ,Physical Sciences ,Effective Field Theories of QCD ,Particle Nature of Dark Matter ,Sigma Models ,Mathematical Physics ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Quantum Physics ,Nuclear & Particles Physics ,Mathematical physics ,Nuclear and plasma physics ,Particle and high energy physics - Abstract
We present a model of self-interacting dark matter based on QCD-like theories and inspired by the proximity of a0(980 ± 20) to the KK¯ (990) threshold. Dark matter is comprised of dark pions which self-scatter via the σ resonance close to the ππ 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.
- Published
- 2022