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The kinetic decoupling of dark matter (DM) from the primordial plasma setsthe size of the first and smallest dark matter halos. Studies of the DM kineticdecoupling have hitherto mostly neglected interactions between the DM and thequarks in the plasma. Here we illustrate their importance using two frameworks:a version of the Minimal Supersymmetric Standard Model (MSSM) and an effectivefield theory with effective DM-quark interaction operators. We connect particlephysics and astrophysics obtaining bounds on the smallest dark matter halo sizefrom collider data and from direct dark matter search experiments. In the MSSMframework, adding DM-quark interactions to DM-lepton interactions more thandoubles the smallest dark matter halo mass in a wide range of thesupersymmetric parameter space.

The effect of quark interactions on dark matter kinetic decoupling and the mass of the smallest dark halos