ATLAS results on heavy flavour production and its relation to quark matter

We present measurements of J/psi and psi(2S) production in proton-lead collisions at a centre of mass energy per nucleon-nucleon interaction of root s(NN) = 5.02 TeV and in proton proton collisions at root s = 2.76 TeV, with integrated luminosities of 28.1 nb(-1) and 4.0 pb(-1), respectively. Both measurements are based on data recorded by the ATLAS detector in 2013 and are performed in the dimuon decay channel. Prompt components of J/psi and psi(2S) are separated from the nonprompt components resulting from b-hadron decays through an analysis of the distance between the J/psi and psi(2S) decay vertexes and the event primary vertex. The measurements of nuclear modification factors and self-normalized yields for the J/psi and psi(2S) are performed in the following ranges: 8.5 < p(T)(mu mu) < 30 GeV in transverse momentum, -1.5 < y(mu mu)* < 1.5 in centre-of-mass rapidity and 0 - 90% in centrality. The differential cross se ction for production of nonprompt J/psi is compared to a FONLL calculation which does not include nuclear effects for the ranges of 8 < p(T)(mu mu) < 30 GeV in transverse momentum, and for vertical bar y*vertical bar(mu mu) < 1.94 in centre-of-mass rapidity. Forward-backward production ratios are presented and compared to theoretical predictions.