#### t-channel Single ${{\mathit t}}$ Production Cross Section in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV

Direct probe of the ${{\mathit t}}{{\mathit b}}{{\mathit W}}$ coupling and possible new physics at $\sqrt {s }$ = 7 TeV.
VALUE (pb) DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$67.5$ $\pm5.7$ 1
 2019 R
LHC combination of ATLAS+CMS
$68$ $\pm2$ $\pm8$ 2
 2014 BI
ATLS ${{\mathit \ell}}$ + $\not E_T$ + 2j or 3j
$83$ $\pm4$ ${}^{+20}_{-19}$ 3
 2012 CH
ATLS ${{\mathit t}}$ -channel ${{\mathit \ell}}$ + $\not E_T$+ (2,3)j (1${{\mathit b}}$ )
$67.2$ $\pm6.1$ 4
 2012 BQ
CMS ${{\mathit t}}$ -channel ${{\mathit \ell}}$ + $\not E_T$+ ${}\geq{}$2j (1${{\mathit b}}$ )
$83.6$ $\pm29.8$ $\pm3.3$ 5
 2011 R
CMS ${{\mathit t}}$ -channel
 1 AABOUD 2019R based on 1.17 to 5.1 fb${}^{-1}$ of data from ATLAS and CMS at 7 TeV.
 2 Based on 4.59 fb${}^{-1}$ of data, using neural networks for signal and background separation. ${\mathit \sigma (}$ ${{\mathit t}}{{\mathit q}}{)}$ = $46$ $\pm1$ $\pm6$ pb and ${\mathit \sigma (}$ ${{\overline{\mathit t}}}{{\mathit q}}{)}$ = $23$ $\pm1$ $\pm3$ pb are separately measured, as well as their ratio ${{\mathit R}}$ = ${\mathit \sigma (}$ ${{\mathit t}}{{\mathit q}}{)}/{\mathit \sigma (}$ ${{\overline{\mathit t}}}{{\mathit q}}{)}$ = $2.04$ $\pm0.13$ $\pm0.12$. The results are for ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV, and those for other ${\mathit m}_{{{\mathit t}}}$ values are given by eq.(4) and Table IV. The measurements give $\vert V_{tb}\vert$ = $1.02$ $\pm0.07$ or $\vert V_{tb}\vert$ $>$ 0.88 (95$\%$ CL).
 3 Based on 1.04 fb${}^{-1}$ of data. The result gives $\vert V_{tb}\vert$ = $1.13$ ${}^{+0.14}_{-0.13}$ from the ratio ${\mathit \sigma (}$exp${)}/{\mathit \sigma (}$th${)}$, where ${\mathit \sigma (}$th${)}$ is the SM prediction for $\vert V_{tb}\vert$ = 1. The 95$\%$ CL lower bound of $\vert V_{tb}\vert$ $>$ 0.75 is found if $\vert V_{tb}\vert$ $<$ 1 is assumed. ${\mathit \sigma (}{{\mathit t}}{)}$ = $59$ ${}^{+18}_{-16}$ pb and ${\mathit \sigma (}{{\overline{\mathit t}}}{)}$ = $33$ ${}^{+13}_{-12}$ pb are found for the separate single ${{\mathit t}}$ and ${{\overline{\mathit t}}}$ production cross sections, respectively. The results assume ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV for the acceptance.
 4 Based on 1.17 fb${}^{-1}$ of data for ${{\mathit \ell}}$ = ${{\mathit \mu}}$ , 1.56 fb${}^{-1}$ of data for ${{\mathit \ell}}$ = ${{\mathit e}}$ at 7 TeV collected during 2011. The result gives $\vert V_{tb}\vert$ = $1.020$ $\pm0.046$(meas)$\pm0.017$(th). The 95$\%$ CL lower bound of $\vert V_{tb}\vert$ $>$ 0.92 is found if $\vert V_{tb}\vert$ $<$ 1 is assumed. The results assume ${\mathit m}_{{{\mathit t}}}$ = 172.5 GeV for the acceptance.
 5 Based on 36 pb${}^{-1}$ of data. The first error is statistical + systematic combined, the second is luminosity. The result gives $\vert V_{tb}\vert$ = $1.114$ $\pm0.22$(exp)$\pm0.02$(th) from the ratio ${\mathit \sigma (}$exp${)}/{\mathit \sigma (}$th${)}$, where ${\mathit \sigma (}$th${)}$ is the SM prediction for $\vert V_{tb}\vert$ = 1. The 95$\%$ CL lower bound of $\vert V_{tb}\vert$ $>$ 0.62 (0.68) is found from the 2D (BDT) analysis under the constraint 0 $<$ $\vert V_{tb}\vert ^2$ $<$ 1.
References:
 AABOUD 2019R
JHEP 1905 088 Combinations of single-top-quark production cross-section measurements and |f$_{LV}$V$_{tb}$| determinations at $\sqrt{s}$ = 7 and 8 TeV with the ATLAS and CMS experiments
PR D90 112006 Comprehensive Measurements of ${\mathit {\mathit t}}$-Channel Single Top-Quark Production Cross Sections at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
PL B717 330 Measurement of the $\mathit t$-Channel Single Top-Quark Production Cross Section in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
JHEP 1212 035 Measurement of the Single-Top-Quark $\mathit t$-Channel Cross Section in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
PRL 107 091802 Measurement of the $\mathit t$-Channel Single Top Quark Production Cross Section in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV