Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at √s = 7 TeV with the ATLAS detector
Author(s)Taylor, Frank E.
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The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets) in proton–proton collisions at a centre-of-mass energy of √s =7 TeV, using the ATLAS detector at the LHC. The measurements use data corresponding to an integrated luminosity of 34 pb[superscript −1]. The b-jets are identified using either a lifetime-based method, where secondary decay vertices of b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based method where the presence of a muon is used to identify semileptonic decays of b-hadrons inside jets. The inclusive b-jet cross-section is measured as a function of transverse momentum in the range 20<p [subscript T]<400 GeV and rapidity in the range |y|<2.1. The b[bar over b]-dijet cross-section is measured as a function of the dijet invariant mass in the range 110<m [subscript jj]<760 GeV, the azimuthal angle difference between the two jets and the angular variable χ in two dijet mass regions. The results are compared with next-to-leading-order QCD predictions. Good agreement is observed between the measured cross-sections and the predictions obtained using POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured b[bar over b]-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.
DepartmentMassachusetts Institute of Technology. Department of Physics
The European Physical Journal C
Aad, G., B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. “Measurement of the Inclusive and Dijet Cross-Sections of b-Jets in Pp Collisions at √s = 7 TeV with the ATLAS Detector.” Eur. Phys. J. C 71, no. 12 (December 2011). © 2011 CERN for the benefit of the ATLAS collaboration
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