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|Title:||Measurements of fiducial cross-sections for t¯t production with one or two additional b-jets in pp collisions at √s = 8 TeV using the ATLAS detector|
|Other Titles:||Measurements of fiducial cross-sections for t -bar t production with one or two additional b-jets in pp collisions at root s = 8 TeV using the ATLAS detector|
|Citation:||European Physical Journal C, 2016; 76(1):11-1-11-37|
|G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... [et al.] (The ATLAS Collaboration)|
|Abstract:||Fiducial cross-sections for t¯t production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb⁻¹ of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for t¯t events with at least one additional b-jet is measured to be 950 ± 70 (stat.) +240−190 (syst.) fb in the lepton-plus-jets channel and 50 ± 10 (stat.) +15−10 (syst.) fb in the eμ channel. The cross-section times branching ratio for events with at least two additional b-jets is measured to be 19.3 ± 3.5 (stat.) ± 5.7 (syst.) fb in the dilepton channel (eμ, μμ, and ee) using a method based on tight selection criteria, and 13.5 ± 3.3 (stat.) ± 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 ± 0.33 (stat.) ± 0.28 (syst.)% for the ratio of t¯t production with two additional b-jets to t¯t production with any two additional jets. All measurements are in good agreement with recent theory predictions.|
|Rights:||© CERN for the benefit of the ATLAS collaboration 2016. This article is published with open access at Springerlink.com|
|Appears in Collections:||Physics publications|
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