Measurement of the cross section ratio σttbb/σttjj in pp collisions at √s=8 TeV

Abstract

The first measurement of the cross section ratio View the MathML source is presented using a data sample corresponding to an integrated luminosity of 19.6 fb−1 collected in pp collisions at View the MathML source with the CMS detector at the LHC. Events with two leptons (e or μ ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pT of both 20 and 40 GeV/c . The measured ratio is View the MathML source for pT>20 GeV/c. The absolute cross sections View the MathML source and View the MathML source are also measured. The measured ratio for pT>40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.