Measurement of top-quark pair production in association with charm quarks in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
Phys.Lett.B 860 (2025) 139177, 2025.

Abstract (data abstract)
CERN-LHC. Inclusive cross-sections for top-quark pair production in association with charm quarks in proton-proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140 fb$^{-1}$, collected with the ATLAS experiment at the LHC between 2015 and 2018. The measurements are performed by requiring one or two charged leptons (electrons and muons), two $b$-tagged jets, and at least one additional jet in the final state. A custom flavor-tagging algorithm is employed for the simultaneous identification of $b$-jets and $c$-jets.

  • Measured cross-sections

    Additional material not provided in the main body

    10.17182/hepdata.154444.v1/t1

    Measured cross-section values in the fiducial phase space and inclusive volume for the various $t\bar{t}+jets$ categories.

  • Fig. 4a

    Data from the main body, figure 4a, page 14 in the preprint

    10.17182/hepdata.154444.v1/t2

    Post-fit agreement between data and MC prediction for $SR_{\mathrm{loose}}^{1\ell5j}$ signal region, which uses the invariant mass of the two geometrically...

  • Fig. 4b

    Data from the main body, figure 4b, page 14 in the preprint

    10.17182/hepdata.154444.v1/t3

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{tight}}^{1\ell5j}$ signal region, which uses the invariant mass of the two...

  • Fig. 4c

    Data from the main body, figure 4c, page 14 in the preprint

    10.17182/hepdata.154444.v1/t4

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{loose}}^{2\ell3j}$ signal region, which uses the invariant mass of the c-tagged...

  • Fig. 5a

    Data from the main body, figure 5a, page 15 in the preprint

    10.17182/hepdata.154444.v1/t5

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{loose}}^{1\ell6ji}$ signal region, which uses the jet multiplicity, $N_{\mathrm{jets}}$, as an...

  • Fig. 5b

    Data from the main body, figure 5b, page 15 in the preprint

    10.17182/hepdata.154444.v1/t6

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{tight}}^{1\ell6ji}$ signal region, which uses the jet multiplicity, $N_{\mathrm{jets}}$, as an...

  • Fig. 5c

    Data from the main body, figure 5c, page 15 in the preprint

    10.17182/hepdata.154444.v1/t7

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{loose}}^{2\ell4ji}$ signal region, which uses the jet multiplicity, $N_{\mathrm{jets}}$, as an...

  • Fig. 5d

    Data from the main body, figure 5d, page 15 in the preprint

    10.17182/hepdata.154444.v1/t8

    Post-fit agreement between data and MC prediction for the $SR_{\mathrm{tight}}^{2\ell4ji}$ signal region, which uses the jet multiplicity, $N_{\mathrm{jets}}$, as an...

  • Table 1

    Data from the main body, table 1, page 9 in the preprint

    10.17182/hepdata.154444.v1/t9

    Jet multiplicity and tagging criteria for the SRs and CRs in the single-lepton and dilepton channels. All single-lepton regions are...

  • Table 2

    Data from the main body, table 2, page 16 in the preprint

    10.17182/hepdata.154444.v1/t10

    Breakdown of the fiducial $t\bar{t}+{\geq}2c$ and $t\bar{t}+1c$ cross-section uncertainties. Systematic uncertainties are grouped into signal and background modeling, instrumental, and...

  • Table 3

    Data from the main body, table 3, page 16 in the preprint

    10.17182/hepdata.154444.v1/t11

    Measured fiducial cross-section values in comparison with various NLO+PS predictions. The uncertainties in the predictions include independent and simultaneous variations...

  • Table 4

    Data from the main body, table 4, page 18 in the preprint

    10.17182/hepdata.154444.v1/t12

    Measured and predicted values for the $t\bar{t}+{\geq}1b$, $t\bar{t}+{\geq}2c$, and $t\bar{t}+1c$ cross-sections and for the cross-section ratios of these processes to...

  • Auxiliary material, Fig. 4a

    Data from auxiliary material, figure 4a

    10.17182/hepdata.154444.v1/t13

    Nuisance parameters with a large impact on the fiducial measurement: ranking of the ten most impactful nuisance parameters for the...

  • Auxiliary material, Fig. 4b

    Data from auxiliary material, figure 4b

    10.17182/hepdata.154444.v1/t14

    Nuisance parameters with a large impact on the fiducial measurement: ranking of the ten most impactful nuisance parameters for the...

  • Auxiliary material, Fig. 4c

    Data from auxiliary material, figure 4c

    10.17182/hepdata.154444.v1/t15

    Nuisance parameters with a large impact on the fiducial measurement: ranking of the ten most impactful nuisance parameters for the...

  • Auxiliary material, Fig. 4d

    Data from auxiliary material, figure 4d

    10.17182/hepdata.154444.v1/t16

    Nuisance parameters with a large impact on the fiducial measurement: ranking of the ten most impactful nuisance parameters for the...

  • Auxiliary material, table 1a

    Data from auxiliary material, table 1, part a

    10.17182/hepdata.154444.v1/t17

    Efficiencies and rejection rates for the $b$- and $c$-jet tagging working points of the $b/c$-tagger, as well as the selection...

  • Auxiliary material, table 1b

    Data from auxiliary material, table 1, part b

    10.17182/hepdata.154444.v1/t18

    Efficiencies and rejection rates for the $b$- and $c$-jet tagging working points of the $b/c$-tagger, as well as the selection...

  • Auxiliary material, table 2

    Data from auxiliary material, table 2

    10.17182/hepdata.154444.v1/t19

    Pre-fit event yields in the twelve single-lepton and dilepton control regions (CRs) of the analysis. The quoted uncertainties include both...

  • Auxiliary material, table 3

    Data from auxiliary material, table 3

    10.17182/hepdata.154444.v1/t20

    Pre-fit event yields in the seven signal regions (SRs) of the analysis. The quoted uncertainties include both statistical and systematic...

  • Auxiliary material, table 4

    Data from auxiliary material, table 4

    10.17182/hepdata.154444.v1/t21

    Post-fit event yields in the twelve single-lepton and dilepton control regions (CRs) of the analysis. The quoted uncertainties include both...

  • Auxiliary material, table 5

    Data from auxiliary material, table 5

    10.17182/hepdata.154444.v1/t22

    Post-fit event yields in the seven signal regions (SRs) of the analysis. The quoted uncertainties include both statistical and systematic...

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