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

CMS Collaboration

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The first measurement of the cross section ratio σtt¯bb¯tt¯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 pT of both 20 and 40 GeV/c. The measured ratio is 0.022±0.003(stat)±0.005(syst) for pT>20 GeV/c. The absolute cross sections σtt¯bb¯ and σtt¯jj are also measured. The measured ratio for pT>40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.

Original languageEnglish
Pages (from-to)132-153
Number of pages22
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - Jun 30 2015


  • CMS
  • Physics
  • Top physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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