# ${{\boldsymbol t}}{{\overline{\boldsymbol t}}}$ Production Cross Section in ${{\boldsymbol p}}{{\boldsymbol p}}$ Collisions at $\sqrt {s }$ = 8 TeV INSPIRE search

Unless otherwise noted the first quoted error is from statistics, the second from systematic uncertainties, and the third from luminosity. If only two errors are quoted the luminosity is included in the systematic uncertainties.
VALUE (pb) DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$239$ $\pm4$ $\pm28$ $\pm5$ 1
 2017 Z
ATLS ${{\mathit \tau}_{{h}}}+\not E_T+{}\geq{}$2j (${}\geq{}2{{\mathit b}}$)
$228.5$ $\pm3.8$ $\pm13.7$ $\pm6.0$ 2
 2017 B
CMS ${{\mathit \ell}}+\not E_T+{}\geq{}$4j (${}\geq{}1{{\mathit b}}$)
$242.9$ $\pm1.7$ $\pm8.6$ 3
 2016 BK
ATLS ${{\mathit e}}$ + ${{\mathit \mu}}$ + 1 or 2${{\mathit b}}$ jets
$244.9$ $\pm1.4$ ${}^{+6.3}_{-5.5}$ $\pm6.4$ 4
 2016 AW
CMS ${{\mathit e}}$ + ${{\mathit \mu}}$ + $\not E_T$ + ${}\geq{}$0j
$275.6$ $\pm6.1$ $\pm37.8$ $\pm7.2$ 5
 2016 BC
CMS ${}\geq{}$6j (${}\geq{}2{{\mathit b}}$)
$260$ $\pm1$ ${}^{+24}_{-25}$ 6
 2015 BP
ATLS ${{\mathit \ell}}+\not E_T+{}\geq{}$3j (${}\geq{}1{{\mathit b}}$)
7
 2015 R
LHCB ${{\mathit \mu}}+{}\geq{}$1j(${{\mathit b}}$-tag) forward region
$242.4$ $\pm1.7$ $\pm10.2$ 8
 2014 AY
ATLS ${{\mathit e}}$ + ${{\mathit \mu}}$ + 1 or 2${{\mathit b}}$ jets
$239$ $\pm2$ $\pm11$ $\pm6$ 9
 2014 F
CMS ${{\mathit \ell}}{{\mathit \ell}}+\not E_T+{}\geq{}$2j (${}\geq{}$1 ${{\mathit b}}$-tag)
$257$ $\pm3$ $\pm24$ $\pm7$ 10
 2014 S
CMS ${{\mathit \ell}}+{{\mathit \tau}_{{h}}}+\not E_T+{}\geq{}$2j (${}\geq{}1{{\mathit b}}$)
1  AABOUD 2017Z based on 20.2 fb${}^{-1}$ of data, using the mode ${{\mathit t}}$ ${{\overline{\mathit t}}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \nu}}{{\mathit q}^{\,'}}{{\overline{\mathit q}}}{{\mathit b}}{{\overline{\mathit b}}}$ with ${{\mathit \tau}}$ decaying hadronically. Single prong and 3 prong decays of ${{\mathit \tau}}$ are separately analyzed. The result is consistent with the SM. The third quoted uncertainty is due to luminosity.
2  KHACHATRYAN 2017B based on 19.6 fb${}^{-1}$ of data, using a binned likelihood fit of templates to the data. Also the ratio ${\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 8 TeV${)}/{\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 7 TeV${)}$ = $1.43$ $\pm0.04$ $\pm0.07$ $\pm0.05$ is reported. The results are in agreement with NNLO SM predictions.
3  AAD 2016BK is an update of the value from AAD 2014AY using the improved luminosity calibration. The value $242.9$ $\pm1.7$ $\pm5.5$ $\pm5.1$ $\pm4.2$ pb is reported, where we have combined the systematic uncertainties in quadrature. Also the ratio ${\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 8TeV${)}/{\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 7TeV${)}$ = $1.328$ $\pm0.024$ $\pm0.015$ $\pm0.038$ $\pm0.001$ has been updated. The former result is consistent with the SM predictions at NNLO, while the latter result is 2.1 $\sigma$ below the expectation.
4  KHACHATRYAN 2016AW based on 19.7 fb${}^{-1}$ of data, using a binned likelihood fit to differential distributions of ${{\mathit b}}$-tagged and non-${{\mathit b}}$-tagged jets. The result is in good agreement with NNLO SM predictions.
5  KHACHATRYAN 2016BC based on 18.4 fb${}^{-1}$ of data. The last uncertainty is due to luminosity. Cuts on kinematical fit probability and ${{\mathit \Delta}}{{\mathit R}}({{\mathit b}},{{\mathit b}}$) are imposed. The major QCD background is determined from the data. The result is for ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV and in agreement with the SM prediction. The top quark ${{\mathit p}_{{T}}}$ spectra, also measured, are significantly softer than theoretical predictions.
6  AAD 2015BP based on 20.3 fb${}^{-1}$ of data. The result is for ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV and in agreement with the SM prediction $253$ ${}^{+13}_{-15}$ pb at NNLO+NNLL.
7  AAIJ 2015R, based on 2.0 fb${}^{-1}$ of data, reports $0.289$ $\pm0.043$ $\pm0.040$ $\pm0.029$ pb cross section for the forward fiducial region ${{\mathit p}_{{T}}}$ (${{\mathit \mu}}$) $>$ 25 GeV, 2.0 $<$ ${{\mathit \eta}}({{\mathit \mu}}$) $<$ 4.5, 50 GeV $<$ ${{\mathit p}_{{T}}}$ (${{\mathit b}}$) $<$ 100 GeV, 2.2 $<$ ${{\mathit \eta}}({{\mathit b}}$) $<$ 4.2, ${{\mathit \Delta}}{{\mathit R}}({{\mathit \mu}},{{\mathit b}}$) $>$ 0.5, and ${{\mathit p}_{{T}}}$ (${{\mathit \mu}}+{{\mathit b}}$) $>$ 20 GeV. The three errors are from statistics, systematics, and theory. The result agrees with the SM NLO prediction.
8  AAD 2014AY reports $242.4$ $\pm1.7$ $\pm5.5$ $\pm7.5$ $\pm4.2$ pb value based on 20.3 fb${}^{-1}$ of data. The four errors are from statistics, systematic, luminosity, and the 0.66$\%$ beam energy uncertainty. We have combined the systematic uncertainties in quadrature. The result is for ${\mathit m}_{{{\mathit t}}}$ = 172.5GeV; for other ${\mathit m}_{{{\mathit t}}}$, ${\mathit \sigma (}{\mathit m}_{{{\mathit t}}}{)}$ = ${\mathit \sigma (}$172.5GeV${)}{\times }[1-0.0028{\times }({\mathit m}_{{{\mathit t}}}-172.5$GeV)]. Also measured is the ratio ${\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 8TeV${)}/{\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}$ ; 7TeV${)}$ = $1.326$ $\pm0.024$ $\pm0.015$ $\pm0.049$ $\pm0.001$. The results are consistent with the SM predictions at NNLO.
9  Based on 5.3 fb${}^{-1}$ of data. The result is for ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV, and a parametrization is given in eq.(6.1) for the mean value at other ${\mathit m}_{{{\mathit t}}}$ values. The result is in agreement with the SM prediction $252.9$ ${}^{+6.4}_{-8.6}$ pb at NNLO.
10  Based on 19.6 fb${}^{-1}$ of data. The measurement is in the channel ${{\mathit t}}$ ${{\overline{\mathit t}}}$ $\rightarrow$ ( ${{\mathit b}}{{\mathit \ell}}{{\mathit \nu}}$) ( ${{\mathit b}}{{\mathit \tau}}{{\mathit \nu}}$), where ${{\mathit \tau}}$ decays into hadrons (${{\mathit \tau}_{{h}}}$). The result is for ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV. For ${\mathit m}_{{{\mathit t}}}$ = 173.3 GeV, the cross section is lower by 3.1 pb.
References:
 AABOUD 2017Z
PR D95 072003 Measurement of the ${{\mathit t}}{{\overline{\mathit t}}}$ Production Cross Section in the ${{\mathit \tau}}$ + Jets Final State in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV using the ATLAS Detector
 KHACHATRYAN 2017B
EPJ C77 15 Measurements of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Production Cross Section in Lepton+Jets Final States in ${{\mathit p}}{{\mathit p}}$ Collisions at 8 TeV and Ratio of 8 to 7 TeV Cross Sections
EPJ C76 642 Addendum to AAD 2014AY: Measurement of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Production Cross-Section using ${{\mathit e}}{{\mathit \mu}}$ Events with ${\mathit {\mathit b}}$-Tagged Jets in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 and 8 TeV with the ATLAS Detector
 KHACHATRYAN 2016AW
JHEP 1608 029 Measurement of the ${\mathit {\mathit t}}−{\mathit {\overline{\mathit t}}}$ Production Cross Section in the ${{\mathit e}}−{{\mathit \mu}}$ Channel in Proton-Proton Collisions at $\sqrt {s }$ = 7 and 8 TeV
 KHACHATRYAN 2016BC
EPJ C76 128 Measurement of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Production Cross Section in the All-Jets Final State in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
EPJ C74 3109 Measurement of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Production Cross-Section using ${{\mathit e}}{{\mathit \mu}}$ Events with ${\mathit {\mathit b}}$-Tagged Jets in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 and 8 TeV with the ATLAS Detector
JHEP 1402 024 Measurement of the ${{\mathit t}}{{\overline{\mathit t}}}$ Production Cross Section in the Dilepton Channel in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
PL B739 23 Measurement of the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Production Cross Section in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV in Dilepton Final States Containing one ${{\mathit \tau}}$ Lepton