# ${{\boldsymbol t}}{{\overline{\boldsymbol t}}}$ Charge Asymmetry (A$_{C}$) in ${{\boldsymbol p}}{{\boldsymbol p}}$ Collisions at $\sqrt {s }$ = 7 TeV INSPIRE search

A$_{C}$ = (N($\Delta \vert$y$\vert >$0) $−$ N($\Delta \vert$y$\vert <$0) ) $/$ (N($\Delta \vert$y$\vert >$0) + N($\Delta \vert$y$\vert <$0) ) where $\Delta \vert$y$\vert$ = $\vert$y$_{{{\mathit t}}}\vert$ $−$ $\vert$y$_{{{\overline{\mathit t}}}}\vert$ is the difference between the absolute values of the top and antitop rapidities and N is the number of events with $\Delta \vert$y$\vert$ positive or negative.
VALUE (%) DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$0.5$ $\pm0.7$ $\pm0.6$ 1
 2018 AM
LHC ATLAS+CMS combination (lepton + jets)
$2.1$ $\pm2.5$ $\pm1.7$ 2
 2015 AJ
ATLS ${{\mathit \ell}}{{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$2j
$0.6$ $\pm1.0$ 3
 2014 I
ATLS ${{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$4j (${}\geq{}$1b)
$-1.0$ $\pm1.7$ $\pm0.8$ 4
 2014 D
CMS ${{\mathit \ell}}{{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$2j (${}\geq{}$1b)
$-1.9$ $\pm2.8$ $\pm2.4$ 5
 2012 BK
ATLS ${{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$4j (${}\geq{}$1b)
$0.4$ $\pm1.0$ $\pm1.1$ 6
 2012 BB
CMS ${{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$4j (${}\geq{}$1b)
$-1.3$ $\pm2.8$ ${}^{+2.9}_{-3.1}$ 7
 2012 BS
CMS ${{\mathit \ell}}$ +$\not E_T$ +${}\geq{}$4j (${}\geq{}$1b)
1  ATLAS and CMS combination based on the data of AAD 2014I and CHATRCHYAN 2012BB. It takes into account the correlations of the measurements and systematic errors. The result is in agreement with the SM prediction (NLO QCD + NLO EW).
2  AAD 2015AJ based on 4.6 fb${}^{-1}$ of data. After kinematic reconstruction the top quark momenta are corrected for detector resolution and acceptance effects by unfolding, using parton level information of the MC generators. The lepton charge asymmetry is measured as A${}^{{{\mathit \ell}}}_{C}$ = $0.024$ $\pm0.015$ $\pm0.009$. All the measurements are consistent with the SM predictions.
3  Based on 4.7 fb${}^{-1}$ of data. The result is consistent with the SM prediction of A$_{C}$ = $0.0123$ $\pm0.0005$. The asymmetry is $0.011$ $\pm0.018$ if restricted to those events where $\beta _{Z}$( ${{\mathit t}}{{\overline{\mathit t}}}$ ) $>$ 0.6, which is also consistent with the SM prediction of $0.020$ ${}^{+0.006}_{-0.007}$.
4  Based on 5.0 fb${}^{-1}$ of data. The lepton charge asymmetry is measured as A${}^{{{\mathit \ell}}}_{C}$ = $0.009$ $\pm0.0010$ $\pm0.006$. A${}^{{{\mathit \ell}}}_{C}$ dependences on ${\mathit m}_{ {{\mathit t}} {{\overline{\mathit t}}} }$, $\vert$y( ${{\mathit t}}{{\overline{\mathit t}}}$ )$\vert$, and ${{\mathit p}_{{T}}}$( ${{\mathit t}}{{\overline{\mathit t}}}$ ) are given in Fig. 5. All measurements are consistent with the SM predictions.
5  Based on 1.04 fb${}^{-1}$ of data. The result is consistent with A$_{C}$ = $0.006$ $\pm0.002$ (MC at NLO). No significant dependence of A$_{C}$ on ${\mathit m}_{\mathrm { {{\mathit t}} {{\overline{\mathit t}}} }}$ is observed.
6  Based on 5.0 fb${}^{-1}$ of data at 7 TeV.
7  Based on 1.09 fb${}^{-1}$ of data. The result is consistent with the SM predictions.
References:
 AABOUD 2018AM
JHEP 1804 033 Combination of inclusive and differential $\mathrm{t}\overline{\mathrm{t}}$ charge asymmetry measurements using ATLAS and CMS data at $\sqrt{s}=7$ and 8 TeV
JHEP 1505 061 Measurement of the Charge Asymmetry in Dileptonic Decays of Top Quark Pairs in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV using the ATLAS Detector
JHEP 1402 107 Measurement of the top Quark Pair Production Charge Asymmetry in Proton-Proton Collisions at $\sqrt {s }$ = 7 TeV using the ATLAS Detector
JHEP 1404 191 Measurements of the ${{\mathit t}}{{\overline{\mathit t}}}$ Charge Asymmetry using the Dilepton Decay Channel in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
EPJ C72 2039 Measurement of the Charge Asymmetry in Top Quark Pair Production in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV using the ATLAS Detector
PL B709 28 Measurement of the Charge Asymmetry in top-Quark Pair Production in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV
PL B717 129 Inclusive and Differential Measurements of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Charge Asymmetry in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV