Measurement of the inclusive tt cross-section in the lepton+jets channel in pp collisions at √s = 8 TeV with the ATLAS detector
Bannoura, Arwa
Original · EN
The inclusive tt production cross-section is measured in the lepton+jets channel using 20.2 fb⁻¹ of proton--proton collision data at a centre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the W+jets process is modelled using Z+jets events in a data-based approach. The inclusive tt cross-section is measured with a precision of 5.7% to be σtt = 248.3 ± 0.7 (stat.) ± 13.4 (syst.) ± 4.7 (lumi.) pb, assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction.
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