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

VALUE (fb) CL% DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<23$ 95 1
 2015 AR
ATLS ${{\mathit \ell}}+\not E_T+{}\geq{}$5j (${}\geq{}$2 ${{\mathit b}}$)
$<70$ 95 2
 2015 BY
ATLS ${}\geq{}2{{\mathit \ell}}+\not E_T+{}\geq{}$2j (${}\geq{}$1 ${{\mathit b}}$)
$<32$ 95 3
 2014 R
CMS ${{\mathit \ell}}+\not E_T+{}\geq{}$6j (${}\geq{}$2 ${{\mathit b}}$)
1  AAD 2015AR based on 20.3 fb${}^{-1}$ of data. A fit to ${{\mathit H}_{{T}}}$ distributions in multi-channels classified by the number of jets and of ${{\mathit b}}$-tagged jets is performed.
2  AAD 2015BY based on 20.3 fb${}^{-1}$ of data. A same-sign lepton pair is required. An excess over the SM prediction reaches 2.5 ${{\mathit \sigma}}$ for hypotheses involving heavy resonances decaying into ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit t}}{{\overline{\mathit t}}}$ .
3  Based on 19.6 fb${}^{-1}$ of data, using a multivariate analysis to separate signal from backgrounds. About ${\mathit \sigma (}$ ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit t}}{{\overline{\mathit t}}}{)}$ = 1 fb is expected in the SM.
References:
JHEP 1508 105 Search for Production of Vector-Like Quark Pairs and of Four Top Quarks in the Lepton-plus-Jets Final State in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
JHEP 1510 150 Analysis of Events with ${\mathit {\mathit b}}$-Jets and a Pair of Leptons of the Same Charge in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
JHEP 1411 154 Search for Standard Model Production of Four Top Quarks in the Lepton + Jets Channel in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV