ATLAS measurements of collective flow of heavy-flavor hadrons in small collision systems

ATLAS measurements of azimuthal anisotropy of heavy flavor mesons in the small systems is presented. A template fit method is used to subtract non-flow contributions using simultaneous fit to low and high charged particle multiplicity samples. The heavy flavor flow in $p$+Pb is studied using multiple probes, including prompt $D^0$ mesons, $J/\psi$, and muons from semi-leptonic decays of heavy flavor hadrons. In $pp$ collisions, flow coefficient for muons from heavy flavor decays, separated for charm and bottom origins, are also presented. The observed heavy flavor azimuthal anisotropies in $p$+Pb and $pp$ collisions are found to be qualitatively similar to those of light hadrons indicating a similar origin for both types of particles.