Heavy flavour production in ATLAS

The associated production of vector boson with quarkonia is a key observable for understanding the quarkonium production mechanisms, including the separation of single and double parton scattering components. Using data collected by the ATLAS experiment, measurements of prompt and non-prompt $J/\psi$ and $\psi(2S)$ mesons with $p_{T}$ between 60-360 GeV is reported at $\sqrt{s}$= 13 TeV in $pp$ collisions. A measurement of the production of a prompt $J/\psi$ in association with a $W^{\pm}$ boson is presented at $\sqrt{s}$=8 TeV in $pp$ collisions.