Research Papers in Physics and Astronomy


Date of this Version



JHEP02(2014)024; doi:10.1007/JHEP02(2014)024


Copyright © 2014 CERN, issued under CC license; published by Springer.


The top-antitop quark (t t¯) production cross section is measured in protonproton collisions at √s = 8TeV 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.