Measurement of the cross section ratio in collisions at σtt¯bb¯/σtt¯jj in pp collisions at s=8 TeV

Abstract

The first measurement of the cross section ratio σ t t ¯ b b ¯ / σ t t ¯ jj is presented using a data sample corresponding to an integrated luminosity of 19.6 fb−1 collected in pp collisions at s = 8   TeV 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 p T of both 20 and 40 GeV/c. The measured ratio is 0.022 ± 0.003 ( stat ) ± 0.005 ( syst ) for p T > 20   GeV / c . The absolute cross sections σ t t ¯ b b ¯ and σ t t ¯ jj are also measured. The measured ratio for p T > 40   GeV / c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order

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