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Measurements of $t \bar t$ charge asymmetry using dilepton final states in pp collisions at $\sqrt s=8$ TeV

The collaboration
Phys.Lett. B760 (2016) 365-386, 2016

Abstract (data abstract)
The charge asymmetry in $\mathrm{t\bar{t}}$ events is measured using dilepton final states produced in pp collisions at the LHC at $\sqrt{s}=8\:$TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5 inverse femtobarns. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The $\mathrm{t\bar{t}}$ and leptonic charge asymmetries are found to be 0.011 +/- 0.011 (stat) +/- 0.007 (syst) and 0.003 +/- 0.006 (stat) +/- 0.003 (syst), respectively. These results, as well as charge asymmetry measurements made as a function of $\mathrm{t\bar{t}}$ system kinematic properties, are in agreement with predictions of the standard model. For the normalized differential cross sections as a function of $\Delta|y_\mathrm{t}|$ and $\Delta|\eta_{\ell}|$ the distributions are normalized to unit area, i.e. the bin values (and their associated covariances) should be multiplied by the bin widths to give the fraction of events in that bin. For the normalized double-differential cross sections as a function of the $\mathrm{t\bar{t}}$ system variables and $\Delta|y_\mathrm{t}|$ or $\Delta|\eta_{\ell}|$, the quoted bin values (and their associated covariances) are for the fraction of events in that bin, such that the sum of all bin contents is equal to one. The lower and upper $\Delta|y_\mathrm{t}|$ and $\Delta|\eta_{\ell}|$ bins (starting and ending at -2 and +2, respectively) contain underflow and overflow events, i.e. the complete distribution from -infinity to +infinity is covered. Bin values are reported to four decimal places, and covariances to four significant figures. Any missing figures are zeros.

• #### Table 1

Data from Table 2

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Inclusive values of the asymmetry variables.

• #### Table 2

Data from Figure 1

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Values of the 6 bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$.

• #### Table 3

Data from Figure 1

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Statistical covariance matrix for the 6 bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$.

• #### Table 4

Data from Figure 1

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Systematic covariance matrix for the 6 bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$.

• #### Table 5

Data from Figure 1

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Values of the 12 bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$.

• #### Table 6

Data from Figure 1

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Statistical covariance matrix for the 12 bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$.

• #### Table 7

Data from Figure 1

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Systematic covariance matrix for the 12 bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$.

• #### Table 8

Data from Figure 2

10.17182/hepdata.71444.v1/t8

Values of $A_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 9

Data from Figure 2

10.17182/hepdata.71444.v1/t9

Statistical correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$.

• #### Table 10

Data from Figure 2

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Systematic correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$.

• #### Table 11

Data from Figure 2

10.17182/hepdata.71444.v1/t11

Fraction of events in each of the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$...

• #### Table 12

Data from Figure 2

10.17182/hepdata.71444.v1/t12

Statistical covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $M_\mathrm{t\bar{t}}$.

• #### Table 13

Data from Figure 2

10.17182/hepdata.71444.v1/t13

Systematic covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $M_\mathrm{t\bar{t}}$.

• #### Table 14

Data from Figure 2

10.17182/hepdata.71444.v1/t14

Values of $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 15

Data from Figure 2

10.17182/hepdata.71444.v1/t15

Statistical correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$.

• #### Table 16

Data from Figure 2

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Systematic correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $M_\mathrm{t\bar{t}}$.

• #### Table 17

Data from Figure 2

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Fraction of events in each of the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$...

• #### Table 18

Data from Figure 2

10.17182/hepdata.71444.v1/t18

Statistical covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $M_\mathrm{t\bar{t}}$.

• #### Table 19

Data from Figure 2

10.17182/hepdata.71444.v1/t19

Systematic covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $M_\mathrm{t\bar{t}}$.

• #### Table 20

Data from Figure 2

10.17182/hepdata.71444.v1/t20

Values of $A_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 21

Data from Figure 2

10.17182/hepdata.71444.v1/t21

Statistical correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 22

Data from Figure 2

10.17182/hepdata.71444.v1/t22

Systematic correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 23

Data from Figure 2

10.17182/hepdata.71444.v1/t23

Fraction of events in each of the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$...

• #### Table 24

Data from Figure 2

10.17182/hepdata.71444.v1/t24

Statistical covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 25

Data from Figure 2

10.17182/hepdata.71444.v1/t25

Systematic covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 26

Data from Figure 2

10.17182/hepdata.71444.v1/t26

Values of $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 27

Data from Figure 2

10.17182/hepdata.71444.v1/t27

Statistical correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 28

Data from Figure 2

10.17182/hepdata.71444.v1/t28

Systematic correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 29

Data from Figure 2

10.17182/hepdata.71444.v1/t29

Fraction of events in each of the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$...

• #### Table 30

Data from Figure 2

10.17182/hepdata.71444.v1/t30

Statistical covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 31

Data from Figure 2

10.17182/hepdata.71444.v1/t31

Systematic covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $p_\mathrm{T}^\mathrm{t\bar{t}}$.

• #### Table 32

Data from Figure 2

10.17182/hepdata.71444.v1/t32

Values of $A_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 33

Data from Figure 2

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Statistical correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$.

• #### Table 34

Data from Figure 2

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Systematic correlation matrix for $A_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$.

• #### Table 35

Data from Figure 2

10.17182/hepdata.71444.v1/t35

Fraction of events in each of the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$...

• #### Table 36

Data from Figure 2

10.17182/hepdata.71444.v1/t36

Statistical covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $|y_\mathrm{t\bar{t}}|$.

• #### Table 37

Data from Figure 2

10.17182/hepdata.71444.v1/t37

Systematic covariance matrix for the $6\times3$ bins of the normalized differential cross section as a function of $\Delta|y_\mathrm{t}|$ and $|y_\mathrm{t\bar{t}}|$.

• #### Table 38

Data from Figure 2

10.17182/hepdata.71444.v1/t38

Values of $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$, and inclusively (bottom row). The value 9999 is used as a...

• #### Table 39

Data from Figure 2

10.17182/hepdata.71444.v1/t39

Statistical correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$.

• #### Table 40

Data from Figure 2

10.17182/hepdata.71444.v1/t40

Systematic correlation matrix for $A^{\mathrm{lep}}_{\mathrm{C}}$ in the 3 bins of $|y_\mathrm{t\bar{t}}|$.

• #### Table 41

Data from Figure 2

10.17182/hepdata.71444.v1/t41

Fraction of events in each of the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$...

• #### Table 42

Data from Figure 2

10.17182/hepdata.71444.v1/t42

Statistical covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $|y_\mathrm{t\bar{t}}|$.

• #### Table 43

Data from Figure 2

10.17182/hepdata.71444.v1/t43

Systematic covariance matrix for the $12\times3$ bins of the normalized differential cross section as a function of $\Delta|\eta_{\ell}|$ and $|y_\mathrm{t\bar{t}}|$.

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