CMS Collaboration, Adair, A., Akgun, B., et al.. "Measurement of the t¯t production cross section in the dilepton channel in pp collisions at √s = 8 TeV." Journal of High Energy Physics, 2014, no. 24 (2014) Springer: http://dx.doi.org/10.1007/JHEP02(2014)024.
The top-antitop quark (tt¯) production cross section is measured in proton-proton collisions at √s = 8 TeV with the CMS experiment at the LHC, using a data sample corresponding to an integrated luminosity of 5.3 fb−1. The measurement is performed by analysing events with a pair of electrons or muons, or one electron and one muon, and at least two jets, one of which is identified as originating from hadronisation of a bottom quark. The measured cross section is 239 ± 2 (stat.) ± 11 (syst.) ± 6 (lum.) pb, for an assumed top-quark mass of 172.5 GeV, in agreement with the prediction of the standard model.
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