Heavy Flavour Production in ATLAS with a focus on inclusive onia

ATLAS has a wide programme to study the production cross section and decay proper- ties of particles with beauty, as well as charmonium and bottomonium states. This paper covers only the ATLAS results in the domain of charmonium production, including J/ψ, ψ(2S) and χc states, B+ production, a brief discussion of the Υ states and updates on the D(∗) meson cross-section analysis. The analyses discussed include double-differential production cross-section measurements of the J/ψ, ψ(2S) and P-wave charmonium states χcJ, extending upon previous measurements in precision and kinematic reach. Prompt and non-prompt modes are distinguished, as well as J/ψ vs ψ(2S) and the contribution to J/ψ production from chic feed-down. Alongside the latter analysis, a competitive mea- surement of the branching fraction B± → χc1K± was also performed. Results of these measurements are compared with the latest theoretical predictions from a variety of theo- retical approaches.