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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 ATLAS 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

    10.17182/hepdata.100351.v2/t1

    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

    10.17182/hepdata.100351.v2/t2

    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

    10.17182/hepdata.100351.v2/t3

    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

    10.17182/hepdata.100351.v2/t4

    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

    10.17182/hepdata.100351.v2/t5

    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

    10.17182/hepdata.100351.v2/t6

    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

    10.17182/hepdata.100351.v2/t7

    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

    10.17182/hepdata.100351.v2/t8

    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

    10.17182/hepdata.100351.v2/t9

    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

    10.17182/hepdata.100351.v2/t10

    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

    10.17182/hepdata.100351.v2/t11

    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

    10.17182/hepdata.100351.v2/t12

    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

    10.17182/hepdata.100351.v2/t13

    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

    10.17182/hepdata.100351.v2/t14

    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

    10.17182/hepdata.100351.v2/t15

    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

    10.17182/hepdata.100351.v2/t16

    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

    10.17182/hepdata.100351.v2/t17

    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

    10.17182/hepdata.100351.v2/t18

    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

    10.17182/hepdata.100351.v2/t19

    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

    10.17182/hepdata.100351.v2/t20

    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

    10.17182/hepdata.100351.v2/t22

    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

    10.17182/hepdata.100351.v2/t23

    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

    10.17182/hepdata.100351.v2/t24

    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

    10.17182/hepdata.100351.v2/t25

    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

    10.17182/hepdata.100351.v2/t31

    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

    10.17182/hepdata.100351.v2/t32

    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

    10.17182/hepdata.100351.v2/t33

    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

    10.17182/hepdata.100351.v2/t38

    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

    10.17182/hepdata.100351.v2/t39

    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

    10.17182/hepdata.100351.v2/t40

    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

    10.17182/hepdata.100351.v2/t42

    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

    10.17182/hepdata.100351.v2/t43

    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

    10.17182/hepdata.100351.v2/t44

    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

    10.17182/hepdata.100351.v2/t45

    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

    10.17182/hepdata.100351.v2/t46

    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

    10.17182/hepdata.100351.v2/t47

    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

    10.17182/hepdata.100351.v2/t48

    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

    10.17182/hepdata.100351.v2/t49

    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

    10.17182/hepdata.100351.v2/t50

    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

    10.17182/hepdata.100351.v2/t51

    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

    10.17182/hepdata.100351.v2/t52

    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

    10.17182/hepdata.100351.v2/t53

    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

    10.17182/hepdata.100351.v2/t54

    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

    10.17182/hepdata.100351.v2/t55

    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

    10.17182/hepdata.100351.v2/t56

    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

    10.17182/hepdata.100351.v2/t57

    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

    10.17182/hepdata.100351.v2/t58

    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

    10.17182/hepdata.100351.v2/t59

    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

    10.17182/hepdata.100351.v2/t60

    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

    10.17182/hepdata.100351.v2/t61

    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

    10.17182/hepdata.100351.v2/t62

    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

    10.17182/hepdata.100351.v2/t63

    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

    10.17182/hepdata.100351.v2/t64

    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

    10.17182/hepdata.100351.v2/t65

    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

    10.17182/hepdata.100351.v2/t66

    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

    10.17182/hepdata.100351.v2/t67

    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

    10.17182/hepdata.100351.v2/t68

    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

    10.17182/hepdata.100351.v2/t69

    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

    10.17182/hepdata.100351.v2/t70

    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

    10.17182/hepdata.100351.v2/t71

    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

    10.17182/hepdata.100351.v2/t72

    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

    10.17182/hepdata.100351.v2/t73

    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

    10.17182/hepdata.100351.v2/t74

    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

    10.17182/hepdata.100351.v2/t75

    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

    10.17182/hepdata.100351.v2/t76

    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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