Measurement of the $b\overline{b}$ dijet cross section in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

Abstract

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 $\sqrt{s}=7$ TeV, using the ATLAS detector at the LHC. The data used correspond to an integrated luminosity of 4.2 fb${}^{-1}$. The cross section is measured for events with two identified $b$-jets with a transverse momentum $p_T>20$ GeV and a minimum separation in the $\eta$-$\varphi$ plane of $\Delta R=0.4$. At least one of the jets in the event is required to have $p_T>270$ 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.

arXiv comment19 pages plus author list ( 36 pages total), 8 figures, 3 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-03/

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• Properties of $g\to b\bar{b}$ at small opening angles in $pp$ collisions with the ATLAS detector at $\sqrt{s}=13$ TeV
• Heavy-Flavour Jets in High-Energy Nuclear Collisions
• Production of forward heavy-flavour dijets at the LHCb within $k_T$-factorization approach