Heavy flavour production in ATLAS

We present a measurement of the inclusive and dijet differential cross sections of jets containing heavy flavour in proton-proton collisions at $sqrt{s} = 7$ TeV using data collected with the ATLAS detector. Jets are reconstructed using the anti-$k_{t}$ algorithm with jet radius parameter $R=0.4$. The presence of a displaced vertex from the decay of long-lived hadrons, or the presence of a muon with significant transverse momentum relative to the jet axis, is used to select a jet sample enriched in $b$-jets and the invariant mass of the charged particle tracks forming the vertex is fitted to extract the fraction of jets from $b$-quark production. The inclusive cross section is measured as a function of the jet transverse momentum, in the range $20 < p_{mathrm{T}} < 260 $ GeV, and of rapidity, in the range $ 0 < |y| < 2.1$, such that jets are fully contained in the tracking detectors of ATLAS. The dijet cross section is measured in the same rapidity range as a function of the dijet invariant mass, extending up to 670 GeV. The resulting cross sections are compared with next-to-leading-order QCD predictions.