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| CMS-TOP-15-003 ; CERN-PH-EP-2015-280 | ||
| Measurement of the top quark pair production cross section in proton-proton collisions at $\sqrt{s}= $ 13TeV | ||
| CMS Collaboration | ||
| 18 October 2015 | ||
| Phys. Rev. Lett. 116 (2016) 052002 | ||
| Abstract: The top quark pair production cross section is measured for the first time in proton-proton collisions at $ \sqrt{s} = $ 13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 pb$^{-1}$. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746 $\pm$ 58 (stat) $\pm$ 53 (syst) $\pm$ 36 (lumi) pb, in agreement with the expectation from the standard model. | ||
| Links: e-print arXiv:1510.05302 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures & Tables | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
The distributions in (left ) the jet multiplicity, and (right ) $H_\mathrm {T}$ in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. |
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Figure 1-a:
The distribution in the jet multiplicity in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
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Figure 1-b:
The distribution in $H_\mathrm {T}$ in events passing the dilepton criteria. The expected distributions for ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ signal and individual backgrounds are shown after implementing data-based corrections; the last bin contains the overflow in events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
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Figure 2:
The distributions in (left ) the dilepton invariant mass, and (right ) the difference in the azimuthal angle between the two leptons after all selections. The last bin in (left ) contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. |
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Figure 2-a:
The distribution in the dilepton invariant mass. The last bin contains the overflow events. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
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Figure 2-b:
The distribution in the difference in the azimuthal angle between the two leptons after all selections. The ratios of data to the sum of the expected yields is given at the bottom of the panel. |
| Tables | |
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Table 1:
Summary of individual contributions to the systematic uncertainty in the $\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }$ measurement. The uncertainties are given in pb, and as relative uncertainties. The separate total systematic uncertainty without integrated luminosity, the part attributed to the integrated luminosity, and the statistical contributions are added in quadrature to obtain the total uncertainty. |
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Table 2:
The number of e$ \mu$ events after final event selection expected for background, and observed in data. The uncertainties represent the statistical and systematic components added in quadrature. |
| Summary |
| Additional Figures | |
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Additional Figure 1:
The $ \mathrm{ t \bar{t} } $ production cross section in $\mathrm{ p \bar{p} } $ and $\mathrm{ p p } $ collisions as a function of $\sqrt{s}$. The Tevatron combination is given at $\sqrt{s}=$ 1.96 TeV [79], as are the CMS results at 7 and 8 TeV in the dilepton channels [14,19]. The CMS result at 13 TeV is also shown in the figure where the inner error bar corresponds to the statistical uncertainty and the outer one to the total uncertainty. The measurements are compared to NNLO+NNLL theoretical predictions [45]. |
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