Production of quarkonia states with the ATLAS detector

A wide program of studies of heavy flavour production at LHC is performed with the ATLAS detector, including charm and beauty hadrons, quarkonia production in both flavours, and associated production of J/psi + W, J/psi + Z and J/psi + J/psi. This report will cover recent results, and discuss in particular the recent result on Jpsi + J/psi, based on the data collected at 8 TeV. The differential cross-section is measured as a function of the transverse momentum of the lower-pT J/psi, the di-J/ψ pT and mass, the difference in rapidity and the azimuthal angle between the two J/psi. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations. The total and double parton scattering cross-sections are compared with predictions.