# Measurements of fiducial cross-sections for tt¯ production with one or two additional bjets in pp collisions at √ s =8 TeV using the ATLAS detector

The ATLAS collaboration

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## Abstract

Fiducial cross-sections for $$t\bar{t}$$ 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 $$t\bar{t}$$ events with at least one additional b-jet is measured to be 950 $$\pm$$ 70 (stat.) $$^{+240}_{-190}$$ (syst.) fb in the lepton-plus-jets channel and 50 $$\pm$$ 10 (stat.) $$^{+15}_{-10}$$ (syst.) fb in the $$e \mu$$ channel. The cross-section times branching ratio for events with at least two additional b-jets is measured to be 19.3 $$\pm$$ 3.5 (stat.) $$\pm$$ 5.7 (syst.) fb in the dilepton channel ($$e \mu$$, $$\mu \mu$$, and ee) using a method based on tight selection criteria, and 13.5 $$\pm$$ 3.3 (stat.) $$\pm$$ 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 $$\pm$$ 0.33 (stat.) $$\pm$$ 0.28 (syst.)% for the ratio of $$t\bar{t}$$ production with two additional b-jets to $$t\bar{t}$$ production with any two additional jets. All measurements are in good agreement with recent theory predictions.
Original language English (US) European Physical Journal E Published - Jan 7 2016

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