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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 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.

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Numerical representation of impact plot.

• #### table_signalregion_cat1_prefit

Figure 7 (upper, left)

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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)

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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)

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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)

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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)

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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)

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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

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

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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

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

• #### particle_abs_ZPt_covariance_stat

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

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

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

• #### particle_abs_SpecQPt_covariance_stat

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

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

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

• #### particle_abs_SpecQAbsEta_covariance_stat

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

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

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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

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

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

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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

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

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

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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

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

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

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

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

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

• #### parton_abs_M3l_covariance_stat

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

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

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

• #### particle_abs_M3l_covariance_stat

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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

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

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

• #### parton_abs_TopPt_covariance_stat

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

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

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

• #### particle_abs_TopPt_covariance_stat

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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

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

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

• #### parton_abs_MtZ_covariance_stat

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

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

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

• #### particle_abs_MtZ_covariance_stat

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

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

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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

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

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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

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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

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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

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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

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

• #### particle_norm_ZPt

Figure 16

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

• #### particle_norm_SpecQPt

Figure 16

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

• #### particle_norm_SpecQAbsEta

Figure 16

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

• #### parton_norm_ZDelPhiLL

Figure 17

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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

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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

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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

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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

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

• #### particle_norm_M3l

Figure 17

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

• #### parton_norm_TopPt

Figure 18

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

• #### particle_norm_TopPt

Figure 18

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

• #### parton_norm_MtZ

Figure 18

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

• #### particle_norm_MtZ

Figure 18

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

• #### parton_norm_CosPol

Figure 18

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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

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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

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Likelihood scan of the top quark spin asymmetry.