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Type: Journal article
Title: Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at √s=7~TeV with the ATLAS detector
Other Titles: Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at root s=7~TeV with the ATLAS detector
Author: The ATLAS Collaboration
Aad, G.
et al.
White, M.
Citation: European Physical Journal C: Particles and Fields, 2011; 71(12):1-22
Publisher: Springer-Verlag
Issue Date: 2011
ISSN: 1434-6044
Statement of
G. Aad ... P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: 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⁻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 T<400 GeV and rapidity in the range |y|<2.1. The bb¯¯-dijet cross-section is measured as a function of the dijet invariant mass in the range 110<m 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 bb¯¯-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.
Description: Published online: 21 December 2011
Rights: © CERN for the benefit of the ATLAS collaboration 2011. Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1140/epjc/s10052-011-1846-4
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