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Measurement of the cross section ratio $\sigma_\mathrm{t \bar{t} b \bar{b}} / \sigma_\mathrm{t \bar{t} jj }$ in pp collisions at $\sqrt{s}$ = 8 TeV

The CMS collaboration
Phys.Lett. B746 (2015) 132-153, 2015.

Abstract (data abstract)
CERN-LHC. The first measurement of the cross section ratio $t\bar{t}b\bar{b}$ / $t\bar{t}jj$ is presented using a data sample corresponding to an integrated luminosity of 19.6 inverse femtobarns collected in pp collisions at $\sqrt{s}$ = 8 TeV with the CMS detector at the LHC. Events with two leptons ($e$ or $\mu$) 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. The measured ratio is 0.022 $\pm$ 0.003 (stat.) $\pm$ 0.005 (syst.) for $p_{\rm T}$ > 20 GeV. The absolute cross sections $t\bar{t}b\bar{b}$ and $t\bar{t}jj$ are also measured. The measured ratio for $p_{\rm T}$ > 40 GeV is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.

  • Table 1

    Data from Table 1


    The number of events for each physics process and for each dilepton category after fitting to the data, their total,...

  • Table 2

    Data from Table 2


    Summary of the systematic uncertainties from various sources contributing to $\sigma_{t\bar{t}b\bar{b}}$, $\sigma_{t\bar{t}jj}$, and the ratio $\sigma_{t\bar{t}b\bar{b}/t\bar{t}jj}$ for a jet pt...

  • Table 3

    Data from Table 3


    The measured cross sections $\sigma_{t\bar{t}b\bar{b}}$ and $\sigma_{t\bar{t}jj}$ and their ratio are given for the visible phase space (PS) defined as...

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