Abstract

The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data were collected in a special LHC low-energy and low-intensity run in 2017, and correspond to an integrated luminosity of 302 pb$^{-1}$. The measurement is performed using events with one electron and one muon of opposite charge, and at least two jets. The measured cross section is 60.7 $\pm$ 5.0 (stat) $\pm$ 2.8 (syst) $\pm$ 1.1 (lumi) pb. To reduce the statistical uncertainty, a combination with the result in the single lepton + jets channel, based on data collected in 2015 at the same center-of-mass energy and corresponding to an integrated luminosity of 27.4 pb$^{-1}$, is then performed. The resulting measured value is 63.0 $\pm$ 4.1 (stat) $\pm$ 3.0 (syst+lumi) pb, in agreement with the standard model prediction of 66.8 $^{+2.9}_{-3.1}$ pb.

Figure 1a

Data from Figure 1 (upper left), located on page 5.

10.17182/hepdata.102986.v1/t1

Leading lepton ${p}_{T}$ in the selected events. The hatched band correspond to systematic and statistical uncertainties. The lower panels show...
Figure 1b

Data from Figure 1 (upper right), located on page 5.

10.17182/hepdata.102986.v1/t2

Subleading lepton ${p}_{T}$ in the selected events. The hatched band correspond to systematic and statistical uncertainties. The lower panels show...
Figure 1c

Data from Figure 1 (lower left), located on page 5.

10.17182/hepdata.102986.v1/t3

Leading jet ${p}_{T}$ in the selected events. The hatched band correspond to systematic and statistical uncertainties. The lower panels show...
Figure 1d

Data from Figure 1 (lower right), located on page 5.

10.17182/hepdata.102986.v1/t4

Jet multiplicity in the selected events. The hatched band correspond to systematic and statistical uncertainties. The lower panels show the...
Figure 2

Data from Figure 2, located on page 10.

10.17182/hepdata.102986.v1/t5

Inclusive ttbar cross section in pp collisions as a function of the center-of-mass energy; previous CMS measurements at 7, 8,...
Table 2

Data from Table 2, located on page 7.

10.17182/hepdata.102986.v1/t6

Summary of the statistical and systematic uncertainty sources for the ttbar cross section measurement.
Table 3

Data from Table 3, located on page 8.

10.17182/hepdata.102986.v1/t7

Event yields for all the processes at the final level of selection.

Figure 1a

Figure 1b

Figure 1c

Figure 1d

Figure 2

Table 2

Table 3

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