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Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at √s=7 TeV with the ATLAS detector

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Berglund, Frida Elina / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Ferrere, Didier / Gadomski, Szymon / Garcia Navarro, Jose Enrique / Gaumer, Olivier / Gonzalez Sevilla, Sergio / Goulette, Marc / Hamilton, Andrew / Iacobucci, Giuseppe / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in European Physical Journal. C. 2011, vol. 71, no. 1846, p. 22
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.
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ATLAS COLLABORATION. Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at √s=7 TeV with the ATLAS detector. In: European Physical Journal. C, 2011, vol. 71, n° 1846, p. 22. https://archive-ouverte.unige.ch/unige:40352

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Deposited on : 2014-09-19

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