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| CMS-TOP-16-005 ; CERN-EP/2016-265 | ||
| Measurement of the $\mathrm{ t \bar{t} }$ production cross section using events in the e$\mu$ final state in pp collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 13 November 2016 | ||
| EPJC 77 (2017) 172 | ||
| Abstract: The cross section of top quark-antiquark pair production in proton-proton collisions at $ \sqrt{s} = $ 13 TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2 fb$^{-1}$. The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 815 $\pm$ 9 (stat) $\pm$ 38 (syst) $\pm$ 19 (lumi) pb, in agreement with the expectation from the standard model. | ||
| Links: e-print arXiv:1611.04040 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Distribution of the jet multiplicity in events passing the dilepton selection criteria. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; the last bin contains the overflow events. The ratio of data to the sum of the expected yields is given at the bottom of the figure. The error bars, which are within the size of the points, indicate the statistical uncertainties. |
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Figure 2:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
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Figure 2-a:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
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Figure 2-b:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
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Figure 2-c:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
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Figure 2-d:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ of the electron, and (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ of the muon after the selection of jets and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; for the left plots (a, c) the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
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Figure 3:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-a:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-b:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-c:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-d:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-e:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
png pdf |
Figure 3-f:
The distributions of (a) $ {p_{\mathrm {T}}} $ and (b) $ {| \eta | }$ for the leading jet, (c) $ {p_{\mathrm {T}}} $ and (d) $ {| \eta | }$ for the sub-leading jet, (e) $H_\mathrm {T}$, and (f) b jet multiplicity after the jets selection and before the b jet requirement. The expected distributions for $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal and individual backgrounds are shown after corrections based on control regions in data are applied; in each plot the last bin contains the overflow events. The ratios of data to the sum of the expected yields are given at the bottom of each panel. The error bars indicate the statistical uncertainties. |
| Tables | |
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Table 1:
Summary of the individual contributions to the uncertainty in the $\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }$ measurement. The first and second uncertainty corresponds to the total and relative component, respectively. The total uncertainty in the result, calculated as the quadratic sum of the individual components, is also given. |
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Table 2:
Number of dilepton events obtained after applying the full selection. The results are given for the individual sources of background, $ {\mathrm{ t } {}\mathrm{ \bar{t} } } $ signal with a top quark mass of 172.5 GeV and ${\sigma _{{\mathrm{ t } {}\mathrm{ \bar{t} } } }} =$ 832$^{+40}_{-46}$ pb, and data. The uncertainties correspond to the statistical component. |
| Summary |
|
A measurement of the $\mathrm{ t \bar{t} }$ production cross section in proton-proton collisions at $ \sqrt{s} = $ 13 TeV is presented for events containing an oppositely charged electron-muon pair, and two or more jets, of which at least one is tagged as originating from a b quark. The measurement is performed through an event-counting method based on a data sample corresponding to an integrated luminosity of 2.2 fb$^{-1}$. The measured cross section is |
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