Evidence for the charge asymmetry in $pp \rightarrow t\bar{t}$ production at $\sqrt{s}= 13$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 08 (2023) 077, 2023.

Abstract (data abstract)
Inclusive and differential measurements of the top-antitop ($t\bar{t}$) charge asymmetry $A_\text{C}^{t\bar{t}}$ and the leptonic asymmetry $A_\text{C}^{\ell\bar{\ell}}$ are presented in proton-proton collisions at $\sqrt{s} = 13$ TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete run 2 data set, corresponding to an integrated luminosity of 139 fb$^{-1}$, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies.A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive $t\bar{t}$ charge asymmetry is measured as $A_\text{C}^{t\bar{t}} = 0.0068 \pm 0.0015$, which differs from zero by 4.7~standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the $t\bar{t}$ system. Both inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections.The measurements are interpreted in the framework of the Standard Model effective field theory, deriving competitive bounds on several Wilson coefficients.

  • Table of contents

    10.17182/hepdata.132116.v1/t1

    - - - - - - - - Overview of HEPData Record - - - - - - - -...

  • Results for charge asymmetry inclusive

    Data from Figure 3(a), Table 3

    10.17182/hepdata.132116.v1/t2

    The unfolded inclusive charge asymmetry. The measured values are given with statistical and systematic uncertainties. The SM theory predictions calculated...

  • Results for charge asymmetry vs mtt

    Data from Figure 3(b), Table 3

    10.17182/hepdata.132116.v1/t3

    The unfolded differential charge asymmetry as a function of the invariant mass of the top pair system. The measured values...

  • Results for charge asymmetry vs pttt

    Data from Figure 4(a), Table 4

    10.17182/hepdata.132116.v1/t4

    The unfolded differential charge asymmetry as a function of the transverse momentum of the top pair system. The measured values...

  • Results for charge asymmetry vs betatt

    Data from Figure 4(b), Table 4

    10.17182/hepdata.132116.v1/t5

    The unfolded differential charge asymmetry as a function of the longitudinal boost of the top pair system. The measured values...

  • Results for leptonic charge asymmetry inclusive

    Data from Figure 6(a), Table 7

    10.17182/hepdata.132116.v1/t6

    The unfolded inclusive leptonic asymmetry. The unfolded $A_C^{\ell\bar{\ell}}$ is obtained in the reduced phase-space defined by the requirement $|\Delta |\eta_{\ell\bar{\ell}}||<2.5$....

  • Results for leptonic charge asymmetry vs mll

    Data from Figure 6(b), Table 7

    10.17182/hepdata.132116.v1/t7

    The unfolded differential leptonic asymmetry as a function of the invariant mass of the di-lepton pair. The unfolded $A_C^{\ell\bar{\ell}}$ is...

  • Results for leptonic charge asymmetry vs ptll

    Data from Figure 6(c), Table 7

    10.17182/hepdata.132116.v1/t8

    The unfolded differential leptonic asymmetry as a function of the transverse momentum of the di-lepton pair. The unfolded $A_C^{\ell\bar{\ell}}$ is...

  • Results for leptonic charge asymmetry vs betall

    Data from Figure 6(d), Table 7

    10.17182/hepdata.132116.v1/t9

    The unfolded differential leptonic asymmetry as a function of the longitudinal boost of the di-lepton pair. The unfolded $A_C^{\ell\bar{\ell}}$ is...

  • Bounds on Wilson coefficients charge asymmetry inclusive

    Data from Table 10

    10.17182/hepdata.132116.v1/t10

    Individual 68% and 95% CL bounds on the relevant Wilson coefficients of the SM Effective Field Theory in units of...

  • Bounds on Wilson coefficients charge asymmetry vs mtt

    Data from Table 10

    10.17182/hepdata.132116.v1/t11

    Individual 68% and 95% CL bounds on the relevant Wilson coefficients of the SM Effective Field Theory in units of...

  • NP ranking charge asymmetry inclusive

    Data from Figure 10(a)

    10.17182/hepdata.132116.v1/t12

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ inclusive measurement. The effect on unfolded $A_C$ for down and...

  • NP ranking charge asymmetry vs betatt bin 0

    Data from Figure 10(b)

    10.17182/hepdata.132116.v1/t13

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement for $\beta_{z,t\bar{t}}$ $\in$ [0,0.3]. The effect on...

  • NP ranking charge asymmetry vs betatt bin 1

    Data from Figure 11(a)

    10.17182/hepdata.132116.v1/t14

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement for $\beta_{z,t\bar{t}}$ $\in$ [0.3,0.6]. The effect on...

  • NP ranking charge asymmetry vs betatt bin 2

    Data from Figure 11(b)

    10.17182/hepdata.132116.v1/t15

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement for $\beta_{z,t\bar{t}}$ $\in$ [0.6,0.8]. The effect on...

  • NP ranking charge asymmetry vs betatt bin 3

    Data from Figure 12(a)

    10.17182/hepdata.132116.v1/t16

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement for $\beta_{z,t\bar{t}}$ $\in$ [0.8,1]. The effect on...

  • NP ranking charge asymmetry vs mtt bin 0

    Data from Figure 12(b)

    10.17182/hepdata.132116.v1/t17

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement for $m_{t\bar{t}}$ < 500 GeV. The effect...

  • NP ranking charge asymmetry vs mtt bin 1

    Data from Figure 13(a)

    10.17182/hepdata.132116.v1/t18

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement for $m_{t\bar{t}}$ $\in$ [500,750] GeV. The effect...

  • NP ranking charge asymmetry vs mtt bin 2

    Data from Figure 13(b)

    10.17182/hepdata.132116.v1/t19

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement for $m_{t\bar{t}}$ $\in$ [750,1000] GeV. The effect...

  • NP ranking charge asymmetry vs mtt bin 3

    Data from Figure 14(a)

    10.17182/hepdata.132116.v1/t20

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement for $m_{t\bar{t}}$ $\in$ [1000,1500] GeV. The effect...

  • NP ranking charge asymmetry vs mtt bin 4

    Data from Figure 14(b)

    10.17182/hepdata.132116.v1/t21

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement for $m_{t\bar{t}}$ > 1500 GeV. The effect...

  • NP ranking charge asymmetry vs pttt bin 0

    Data from Figure 15(a)

    10.17182/hepdata.132116.v1/t22

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $p_{T,t\bar{t}}$ measurement for $p_{T,t\bar{t}}$ < 30 GeV. The effect...

  • NP ranking charge asymmetry vs pttt bin 1

    Data from Figure 15(b)

    10.17182/hepdata.132116.v1/t23

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $p_{T,t\bar{t}}$ measurement for $p_{T,t\bar{t}}$ $\in$ [30,120] GeV. The effect...

  • NP ranking charge asymmetry vs pttt bin 2

    Data from Figure 16

    10.17182/hepdata.132116.v1/t24

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{t\bar{t}}$ vs $p_{T,t\bar{t}}$ measurement for $p_{T,t\bar{t}}$ > 120 GeV. The effect...

  • NP ranking leptonic charge asymmetry inclusive

    Data from Figure 17(a)

    10.17182/hepdata.132116.v1/t25

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ inclusive measurement. The effect on unfolded $A_C$ for down and...

  • NP ranking leptonic charge asymmetry vs betall bin 0

    Data from Figure 17(b)

    10.17182/hepdata.132116.v1/t26

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement for $\beta_{z,\ell\bar{\ell}}$ $\in$[0,0.3]. The effect on unfolded...

  • NP ranking leptonic charge asymmetry vs betall bin 1

    Data from Figure 18(a)

    10.17182/hepdata.132116.v1/t27

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement for $\beta_{z,\ell\bar{\ell}}$ $\in$[0.3,0.6]. The effect on unfolded...

  • NP ranking leptonic charge asymmetry vs betall bin 2

    Data from Figure 18(b)

    10.17182/hepdata.132116.v1/t28

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement for $\beta_{z,\ell\bar{\ell}}$ $\in$[0.6,0.8]. The effect on unfolded...

  • NP ranking leptonic charge asymmetry vs betall bin 3

    Data from Figure 19(a)

    10.17182/hepdata.132116.v1/t29

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement for $\beta_{z,\ell\bar{\ell}}$ $\in$[0.8,1]. The effect on unfolded...

  • NP ranking leptonic charge asymmetry vs mll bin 0

    Data from Figure 19(b)

    10.17182/hepdata.132116.v1/t30

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement for $m_{\ell\bar{\ell}}$ < 200 GeV. The effect...

  • NP ranking leptonic charge asymmetry vs mll bin 1

    Data from Figure 20(a)

    10.17182/hepdata.132116.v1/t31

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement for $m_{\ell\bar{\ell}}$ $\in$ [200,300] GeV. The effect...

  • NP ranking leptonic charge asymmetry vs mll bin 2

    Data from Figure 20(b)

    10.17182/hepdata.132116.v1/t32

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement for $m_{\ell\bar{\ell}}$ $\in$ [300,400] GeV. The effect...

  • NP ranking leptonic charge asymmetry vs mll bin 3

    Data from Figure 21(a)

    10.17182/hepdata.132116.v1/t33

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement for $m_{\ell\bar{\ell}}$ > 400 GeV. The effect...

  • NP ranking leptonic charge asymmetry vs ptll bin 0

    Data from Figure 21(b)

    10.17182/hepdata.132116.v1/t34

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $p_{T,\ell\bar{\ell}}$ measurement for $p_{T,\ell\bar{\ell}}$ < 20 GeV. The effect...

  • NP ranking leptonic charge asymmetry vs ptll bin 1

    Data from Figure 22(a)

    10.17182/hepdata.132116.v1/t35

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $p_{T,\ell\bar{\ell}}$ measurement for $p_{T,\ell\bar{\ell}}$ $\in$ [20, 70] GeV. The...

  • NP ranking leptonic charge asymmetry vs ptll bin 2

    Data from Figure 22(b)

    10.17182/hepdata.132116.v1/t36

    Ranking of the systematic uncertainties with marginalisation for the $A_C^{\ell\ell}$ vs $p_{T,\ell\bar{\ell}}$ measurement for $p_{T,\ell\bar{\ell}}$ > 70 GeV. The effect...

  • NP correlations charge asymmetry inclusive

    Additional material

    10.17182/hepdata.132116.v1/t37

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{t\bar{t}}$ inclusive measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations charge asymmetry vs mtt

    Additional material

    10.17182/hepdata.132116.v1/t38

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations charge asymmetry vs pttt

    Additional material

    10.17182/hepdata.132116.v1/t39

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{t\bar{t}}$ vs $p_{T,t\bar{t}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations charge asymmetry vs betatt

    Additional material

    10.17182/hepdata.132116.v1/t40

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations leptonic charge asymmetry inclusive

    Additional material

    10.17182/hepdata.132116.v1/t41

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{\ell\ell}$ inclusive measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations leptonic charge asymmetry vs mll

    Additional material

    10.17182/hepdata.132116.v1/t42

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations leptonic charge asymmetry vs ptll

    Additional material

    10.17182/hepdata.132116.v1/t43

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{\ell\ell}$ vs $p_{T,\ell\bar{\ell}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • NP correlations leptonic charge asymmetry vs betall

    Additional material

    10.17182/hepdata.132116.v1/t44

    Post-marginalisation correlation coefficients $\rho_{ij}$ of nuisance parameters for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement. Only $|\rho_{ij}| > 0.05$ values are included.

  • Covariance matrix charge asymmetry vs mtt

    Additional material

    10.17182/hepdata.132116.v1/t45

    Covariance matrix for the $A_C^{t\bar{t}}$ vs $m_{t\bar{t}}$ measurement.

  • Covariance matrix charge asymmetry vs pttt

    Additional material

    10.17182/hepdata.132116.v1/t46

    Covariance matrix for the $A_C^{t\bar{t}}$ vs $p_{T,t\bar{t}}$ measurement.

  • Covariance matrix charge asymmetry vs betatt

    Additional material

    10.17182/hepdata.132116.v1/t47

    Covariance matrix for the $A_C^{t\bar{t}}$ vs $\beta_{z,t\bar{t}}$ measurement.

  • Covariance matrix leptonic charge asymmetry vs mll

    Additional material

    10.17182/hepdata.132116.v1/t48

    Covariance matrix for the $A_C^{\ell\ell}$ vs $m_{\ell\bar{\ell}}$ measurement.

  • Covariance matrix leptonic charge asymmetry vs ptll

    Additional material

    10.17182/hepdata.132116.v1/t49

    Covariance matrix for the $A_C^{\ell\ell}$ vs $p_{T,\ell\bar{\ell}}$ measurement.

  • Covariance matrix leptonic charge asymmetry vs betall

    Additional material

    10.17182/hepdata.132116.v1/t50

    Covariance matrix for the $A_C^{\ell\ell}$ vs $\beta_{z,\ell\bar{\ell}}$ measurement.

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