UC Irvine

The dijet production cross section for jets containing a b-hadron (b-jets) has been measured in proton–proton collisions with a centre-of-mass energy of s=7$$\sqrt{s} = 7$$ TeV, using the ATLAS detector at the LHC. The data used correspond to an integrated luminosity of 4.2fb-1$$\mathrm 4.2\,\text {fb}^{-1}$$. The cross section is measured for events with two identified b-jets with a transverse momentum pT>20$$p_{\text {T}} > 20$$ GeV and a minimum separation in the η$$\eta $$–ϕ$$\phi $$ plane of ΔR=0.4$$\Delta R = 0.4$$. At least one of the jets in the event is required to have pT>270$$p_{\text {T}} > 270$$ GeV. The cross section is measured differentially as a function of dijet invariant mass, dijet transverse momentum, boost of the dijet system, and the rapidity difference, azimuthal angle and angular distance between the b-jets. The results are compared to different predictions of leading order and next-to-leading order perturbative quantum chromodynamics matrix elements supplemented with models for parton-showers and hadronization.