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Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson at $\sqrt{s} = 13$ TeV with the ATLAS detector

The collaboration
CERN-EP-2021-01, 2021.

Abstract (data abstract)
CERN-LHC-ATLAS. Measurements of the inclusive and differential fiducial cross-sections for $t\bar{t}+Z$ production in proton-proton collisions at a centre-of-mass energy of 13 TeV with 139 fb−1 of data collected between 2015 and 2018. The fiducial regions for the trilepton channel are defined as: - Exactly 3 leptons ($e$ or $\mu$) with transverse momentum greater than 27, 20, 20 GeV for leading, subleading and third lepton, respectively. - The sum of the three lepton charges is required to be $\pm$1. - At least one opposite-sign-same-flavour (OSSF) lepton pair (considered to be lepton pair from $Z$ boson) with invaraint mass compatible with $Z$ boson ($|m_{\ell\ell}^{Z}-m_{Z}|<10$ GeV) and $m_{OSSF}>10$ GeV for each OSSF lepton pair. - Two orthogonal regions combined for inclusive measurement, different region for differential measurement. - $b$-jets requirements: pseudo-continuous $b$-tagging with different working points for inclusive measurement, fixed 85% $b$-tagging working point for differential measurement. - At least 3 (inclusive and differential region) or 4 (inclusive region) jets The fiducial regions for the tetralepton channel are defined as: - Exactly 4 leptons ($e$ or $\mu$) with transverse momentum greater than 27, 20, 10, 7 GeV for leading, subleading, third and fourth lepton, respectively. - The sum of the four lepton charges is required to be zero. - At least one opposite-sign-same-flavor (OSSF) lepton pair (considered to be lepton pair from $Z$ boson) with invaraint mass compatible with $Z$ boson ($|m_{\ell\ell}^{Z}-m_{Z}|<10$ GeV) and $m_{OSSF}>10$ GeV for each OSSF lepton pair. - Four regions separated based on $b$-jets multiplicity (1$b$ or 2$b$ jets at 85% $b$-tagging working point) and flavour composition of the non-$Z$ lepton pair (same flavour, different flavour). - At least 2 jets. - $E_{T}^{miss}$ requirements (depending on the region) for suppresion of $ZZ$+jets background.

• #### Table 1

Inclusive cross section result

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The measured $t\bar{t}\text{Z}$ cross-section value and its uncertainty based on the fit results from the combined trilepton and tetralepton channels....

• #### Table 2

Data from Table 7

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List of relative uncertainties of the measured inclusive $t\bar{t}\text{Z}$ cross section from the combined fit. The uncertainties are symmetrised for...

• #### Table 3

Data from Table 1

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The definitions of the trilepton signal regions: for the inclusive measurement, a combination of the regions with pseudo-continuous $b$-tagging 3$\ell$-Z-1$b$4$j$-PCBT...

• #### Table 4

Data from Table 2

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The definitions of the four tetralepton signal regions. The regions are defined to target different $b$-jet multiplicities and flavour combinations...

• #### Table 5

Data from Figure 9A

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The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}$ of the $Z$ boson...

• #### Table 6

Data from Figure 9B

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}$ of the $Z$ boson...

• #### Table 7

Data from Figure 10A

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}$ of the $Z$ boson...

• #### Table 8

Data from Figure 10B

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}$ of the $Z$ boson...

• #### Table 9

Data from Figure 11A

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the absolute value of rapidity of...

• #### Table 10

Data from Figure 12A

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The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the number of jets in the...

• #### Table 11

Data from Figure 12B

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The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the number of jets in the...

• #### Table 12

Data from Figure 13A

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{l \textrm{non-}Z}$ in the 3$\ell$...

• #### Table 13

Data from Figure 13B

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (Z, t_{\textrm{lep}})|/\pi$ in...

• #### Table 14

Data from Figure 14A

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta y (Z, t_{\textrm{lep}})|$ in...

• #### Table 15

Data from Figure 14B

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (l_{t}^{+}, l_{\bar{t}}^{-})|/\pi$ in...

• #### Table 16

Data from Figure 15A

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (t\bar{t}, Z)|/\pi$ in...

• #### Table 17

Data from Figure 15B

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The absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{t\bar{t}}$ in the 4$\ell$ channel....

• #### Table 18

Data from Figure 19A

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{l \textrm{non-}Z}$ in the 3$\ell$...

• #### Table 19

Data from Figure 19B

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (Z, t_{\textrm{lep}})|/\pi$ in...

• #### Table 20

Data from Figure 20A

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta y (Z, t_{\textrm{lep}})|$ in...

• #### Table 21

Data from Figure 20B

10.17182/hepdata.100351.v2/t21

The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (l_{t}^{+}, l_{\bar{t}}^{-})|/\pi$ in...

• #### Table 22

Data from Figure 21A

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (t\bar{t}, Z)|/\pi$ in...

• #### Table 23

Data from Figure 21B

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{t\bar{t}}$ in the 4$\ell$ channel....

• #### Table 24

Data from Figure 22A

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The normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the absolute value of rapidity of...

• #### Table 25

Data from Figure 23A

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The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{l \textrm{non-}Z}$ in the 3$\ell$...

• #### Table 26

Data from Figure 23B

10.17182/hepdata.100351.v2/t26

The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (Z, t_{\textrm{lep}})|/\pi$ in...

• #### Table 27

Data from Figure 24A

10.17182/hepdata.100351.v2/t27

The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta y (Z, t_{\textrm{lep}})|$ in...

• #### Table 28

Data from Figure 24B

10.17182/hepdata.100351.v2/t28

The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (l_{t}^{+}, l_{\bar{t}}^{-})|/\pi$ in...

• #### Table 29

Data from Figure 25A

10.17182/hepdata.100351.v2/t29

The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (t\bar{t}, Z)|/\pi$ in...

• #### Table 30

Data from Figure 25B

10.17182/hepdata.100351.v2/t30

The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{t\bar{t}}$ in the 4$\ell$ channel....

• #### Table 31

Data from Figure 26A

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The absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the absolute value of rapidity of...

• #### Table 32

Data from Figure 27A

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{l \textrm{non-}Z}$ in the 3$\ell$...

• #### Table 33

Data from Figure 27B

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (Z, t_{\textrm{lep}})|/\pi$ in...

• #### Table 34

Data from Figure 28A

10.17182/hepdata.100351.v2/t34

The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta y (Z, t_{\textrm{lep}})|$ in...

• #### Table 35

Data from Figure 28B

10.17182/hepdata.100351.v2/t35

The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (l_{t}^{+}, l_{\bar{t}}^{-})|/\pi$ in...

• #### Table 36

Data from Figure 29A

10.17182/hepdata.100351.v2/t36

The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $|\Delta \phi (t\bar{t}, Z)|/\pi$ in...

• #### Table 37

Data from Figure 29B

10.17182/hepdata.100351.v2/t37

The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the $p_{\textrm{T}}^{t\bar{t}}$ in the 4$\ell$ channel....

• #### Table 38

Data from Figure 30A

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the absolute value of rapidity of...

• #### Table 39

Data from Figure 31A

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the number of jets in the...

• #### Table 40

Data from Figure 31B

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The normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the number of jets in the...

• #### Table 41

10.17182/hepdata.100351.v2/t41

The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 42

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 43

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 44

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 45

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 46

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 47

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 48

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The total correlation matrix of the absolute parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 49

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 50

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 51

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 52

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 53

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 54

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 55

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 56

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The total correlation matrix of the normalised parton-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 57

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 58

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 59

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 60

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 61

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 62

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 63

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 64

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 65

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 66

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The total correlation matrix of the absolute particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 67

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 68

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 69

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 70

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 71

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 72

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 73

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 74

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 75

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

• #### Table 76

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The total correlation matrix of the normalised particle-level differential cross-section measured in the fiducial phase-space as a function of the...

Version 2 modifications: Added full likelihood of the profiled fit and updated link to public web page containing auxiliary information.

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