Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-TOP-20-010, 2021.

Abstract (data abstract)
Inclusive and differential cross sections of single top quark production in association with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with an integrated luminosity of $138\ \mathrm{fb}^{-1}$ recorded by the CMS experiment. Events are selected based on the presence of three leptons, electrons or muons, associated with leptonic Z boson and top quark decays. The measurement yields an inclusive cross section of $87.9\text{ }_{-7.3}^{+7.5}\text{ (stat) }_{-6.0}^{+7.3}\text{ (syst) fb}$ for a dilepton invariant mass greater than 30 GeV, in agreement with standard model (SM) calculations. The ratio between the cross sections for the top quark and the top antiquark production in association with a Z boson is measured as $2.37\text{ }_{-0.42}^{+0.56}\text{ (stat) }_{-0.13}^{+0.27}\text{ (syst)}$. Differential measurements at parton and particle levels are performed for the first time. Several kinematic observables are considered to study the modeling of the process. Results are compared to theoretical predictions with different assumptions on the source of the initial-state b quark and found to be in agreement, within the uncertainties. Additionally, the spin asymmetry, which is sensitive to the top quark polarization, is determined from the differential distribution of the polarization angle at parton level to be $0.58\text{ }^{+0.15}_{-0.16} \text{ (stat) } {\pm 0.06}\text{ (syst)}$, in agreement with SM predictions using the MGvATNLO event generator at next-to-leading order.

  • results

    This table summarizes the main results given in the text of the paper

    10.17182/hepdata.105865.v1/t1

    Numerical results of inclusive cross section measurements. Each row represents a measurement: "tZq" for fully inclusive, "tZq_top" for the top...

  • impacts

    This table is a numerical representation of Fig. 8.

    10.17182/hepdata.105865.v1/t2

    Numerical representation of impact plot.

  • table_signalregion_cat1_prefit

    Figure 7 (upper, left)

    10.17182/hepdata.105865.v1/t3

    Simulated signal, total background, and observed data in the signal category with exactly 1 b jet and 2-3 jets for...

  • table_signalregion_cat2_prefit

    Figure 7 (middle, left)

    10.17182/hepdata.105865.v1/t4

    Simulated signal, total background, and observed data in the signal category with exactly 1 b jet and 4 or more...

  • table_signalregion_cat3_prefit

    Figure 7 (lower, left)

    10.17182/hepdata.105865.v1/t5

    Simulated signal, total background, and observed data in the signal category with 2 or more b jets for the three...

  • table_signalregion_cat1_postfit

    Figure 7 (upper, right)

    10.17182/hepdata.105865.v1/t6

    Simulated signal, total background, and observed data in the signal category with exactly 1 b jet and 2-3 jets for...

  • table_signalregion_cat2_postfit

    Figure 7 (middle, right)

    10.17182/hepdata.105865.v1/t7

    Simulated signal, total background, and observed data in the signal category with exactly 1 b jet and 4 or more...

  • table_signalregion_cat3_postfit

    Figure 7 (lower, right)

    10.17182/hepdata.105865.v1/t8

    Simulated signal, total background, and observed data in the signal category with 2 or more b jets for the three...

  • parton_abs_ZPt

    Figure 13

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    Absolute differential cross sections as a function of the transverse momentum of the Z boson candidate at parton level.

  • parton_abs_ZPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t10

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the Z...

  • parton_abs_ZPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t11

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the Z...

  • particle_abs_ZPt

    Figure 13

    10.17182/hepdata.105865.v1/t12

    Absolute differential cross sections as a function of the transverse momentum of the Z boson candidate at particle level.

  • particle_abs_ZPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t13

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the Z...

  • particle_abs_ZPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t14

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the Z...

  • particle_abs_SpecQPt

    Figure 13

    10.17182/hepdata.105865.v1/t15

    Absolute differential cross sections as a function of the transverse momentum of the recoiling jet at particle level.

  • particle_abs_SpecQPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t16

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the recoiling...

  • particle_abs_SpecQPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t17

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the recoiling...

  • particle_abs_SpecQAbsEta

    Figure 13

    10.17182/hepdata.105865.v1/t18

    Absolute differential cross sections as a function of the absolute pseudorapidity of the recoiling jet at particle level.

  • particle_abs_SpecQAbsEta_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t19

    Covariance matrix for the measurement of the differential cross sections as a function of the absolute pseudorapidity of the recoiling...

  • particle_abs_SpecQAbsEta_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t20

    Covariance matrix for the measurement of the differential cross sections as a function of the absolute pseudorapidity of the recoiling...

  • parton_abs_ZDelPhiLL

    Figure 14

    10.17182/hepdata.105865.v1/t21

    Absolute differential cross sections as a function of the difference in azimuthal angle of the leptons, associated to the Z...

  • parton_abs_ZDelPhiLL_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t22

    Covariance matrix for the measurement of the differential cross sections as a function of the difference in azimuthal angle of...

  • parton_abs_ZDelPhiLL_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t23

    Covariance matrix for the measurement of the differential cross sections as a function of the difference in azimuthal angle of...

  • particle_abs_ZDelPhiLL

    Figure 14

    10.17182/hepdata.105865.v1/t24

    Absolute differential cross sections as a function of the difference in azimuthal angle of the leptons, associated to the Z...

  • particle_abs_ZDelPhiLL_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t25

    Covariance matrix for the measurement of the differential cross sections as a function of the difference in azimuthal angle of...

  • particle_abs_ZDelPhiLL_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t26

    Covariance matrix for the measurement of the differential cross sections as a function of the difference in azimuthal angle of...

  • parton_abs_LepPt

    Figure 14

    10.17182/hepdata.105865.v1/t27

    Absolute differential cross sections as a function of the transverse momentum of the leptons, associated to the top candidate at...

  • parton_abs_LepPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t28

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the leptons,...

  • parton_abs_LepPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t29

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the leptons,...

  • particle_abs_LepPt

    Figure 14

    10.17182/hepdata.105865.v1/t30

    Absolute differential cross sections as a function of the transverse momentum of the leptons, associated to the top candidate at...

  • particle_abs_LepPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t31

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the leptons,...

  • particle_abs_LepPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t32

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the leptons,...

  • parton_abs_M3l

    Figure 14

    10.17182/hepdata.105865.v1/t33

    Absolute differential cross sections as a function of the invariant mass of the three-lepton system at parton level.

  • parton_abs_M3l_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t34

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the three-lepton...

  • parton_abs_M3l_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t35

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the three-lepton...

  • particle_abs_M3l

    Figure 14

    10.17182/hepdata.105865.v1/t36

    Absolute differential cross sections as a function of the invariant mass of the three-lepton system at particle level.

  • particle_abs_M3l_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t37

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the three-lepton...

  • particle_abs_M3l_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t38

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the three-lepton...

  • parton_abs_TopPt

    Figure 15

    10.17182/hepdata.105865.v1/t39

    Absolute differential cross sections as a function of the transverse momentum of the top candidate at parton level.

  • parton_abs_TopPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t40

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the top...

  • parton_abs_TopPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t41

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the top...

  • particle_abs_TopPt

    Figure 15

    10.17182/hepdata.105865.v1/t42

    Absolute differential cross sections as a function of the transverse momentum of the top candidate at particle level.

  • particle_abs_TopPt_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t43

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the top...

  • particle_abs_TopPt_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t44

    Covariance matrix for the measurement of the differential cross sections as a function of the transverse momentum of the top...

  • parton_abs_MtZ

    Figure 15

    10.17182/hepdata.105865.v1/t45

    Absolute differential cross sections as a function of the invariant mass of the top-Z system at parton level.

  • parton_abs_MtZ_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t46

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the top-Z...

  • parton_abs_MtZ_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t47

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the top-Z...

  • particle_abs_MtZ

    Figure 15

    10.17182/hepdata.105865.v1/t48

    Absolute differential cross sections as a function of the invariant mass of the top-Z system at particle level.

  • particle_abs_MtZ_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t49

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the top-Z...

  • particle_abs_MtZ_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t50

    Covariance matrix for the measurement of the differential cross sections as a function of the invariant mass of the top-Z...

  • parton_abs_CosPol

    Figure 15

    10.17182/hepdata.105865.v1/t51

    Absolute differential cross sections as a function of the cosine of the top polarization angle, measured in respect to the...

  • parton_abs_CosPol_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t52

    Covariance matrix for the measurement of the differential cross sections as a function of the cosine of the top polarization...

  • parton_abs_CosPol_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t53

    Covariance matrix for the measurement of the differential cross sections as a function of the cosine of the top polarization...

  • particle_abs_CosPol

    Figure 15

    10.17182/hepdata.105865.v1/t54

    Absolute differential cross sections as a function of the cosine of the top polarization angle, measured in respect to the...

  • particle_abs_CosPol_covariance_stat

    Additional material

    10.17182/hepdata.105865.v1/t55

    Covariance matrix for the measurement of the differential cross sections as a function of the cosine of the top polarization...

  • particle_abs_CosPol_covariance_syst

    Additional material

    10.17182/hepdata.105865.v1/t56

    Covariance matrix for the measurement of the differential cross sections as a function of the cosine of the top polarization...

  • parton_norm_ZPt

    Figure 16

    10.17182/hepdata.105865.v1/t57

    Normalized differential cross sections as a function of the transverse momentum of the Z boson candidate at parton level.

  • particle_norm_ZPt

    Figure 16

    10.17182/hepdata.105865.v1/t58

    Normalized differential cross sections as a function of the transverse momentum of the Z boson candidate at particle level.

  • particle_norm_SpecQPt

    Figure 16

    10.17182/hepdata.105865.v1/t59

    Normalized differential cross sections as a function of the transverse momentum of the recoiling jet at parton level.

  • particle_norm_SpecQAbsEta

    Figure 16

    10.17182/hepdata.105865.v1/t60

    Normalized differential cross sections as a function of the absolute pseudorapidity of the recoiling jet at particle level.

  • parton_norm_ZDelPhiLL

    Figure 17

    10.17182/hepdata.105865.v1/t61

    Normalized differential cross sections as a function of the difference in azimuthal angle of the leptons, associated to the Z...

  • particle_norm_ZDelPhiLL

    Figure 17

    10.17182/hepdata.105865.v1/t62

    Normalized differential cross sections as a function of the difference in azimuthal angle of the leptons, associated to the Z...

  • parton_norm_LepPt

    Figure 17

    10.17182/hepdata.105865.v1/t63

    Normalized differential cross sections as a function of the transverse momentum of the leptons, associated to the top candidate at...

  • particle_norm_LepPt

    Figure 17

    10.17182/hepdata.105865.v1/t64

    Normalized differential cross sections as a function of the transverse momentum of the leptons, associated to the top candidate at...

  • parton_norm_M3l

    Figure 17

    10.17182/hepdata.105865.v1/t65

    Normalized differential cross sections as a function of the invariant mass of the three-lepton system at parton level.

  • particle_norm_M3l

    Figure 17

    10.17182/hepdata.105865.v1/t66

    Normalized differential cross sections as a function of the invariant mass of the three-lepton system at particle level.

  • parton_norm_TopPt

    Figure 18

    10.17182/hepdata.105865.v1/t67

    Normalized differential cross sections as a function of the transverse momentum of the top candidate at parton level.

  • particle_norm_TopPt

    Figure 18

    10.17182/hepdata.105865.v1/t68

    Normalized differential cross sections as a function of the transverse momentum of the top candidate at particle level.

  • parton_norm_MtZ

    Figure 18

    10.17182/hepdata.105865.v1/t69

    Normalized differential cross sections as a function of the invariant mass of the top-Z system at parton level.

  • particle_norm_MtZ

    Figure 18

    10.17182/hepdata.105865.v1/t70

    Normalized differential cross sections as a function of the invariant mass of the top-Z system at particle level.

  • parton_norm_CosPol

    Figure 18

    10.17182/hepdata.105865.v1/t71

    Normalized differential cross sections as a function of the cosine of the top polarization angle, measured in respect to the...

  • particle_norm_CosPol

    Figure 18

    10.17182/hepdata.105865.v1/t72

    Normalized differential cross sections as a function of the cosine of the top polarization angle, measured in respect to the...

  • likelihood_spin_asymmetry

    Figure A.22

    10.17182/hepdata.105865.v1/t73

    Likelihood scan of the top quark spin asymmetry.

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