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

VALUE (pb) DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$89.6$ ${}^{+7.1}_{-6.3}$ 1
 2017 T
ATLS ${{\mathit \ell}}+\not E_T$+2 j (1${{\mathit b}}$ j)
$83.6$ $\pm2.3$ $\pm7.4$ 2
 2014 F
CMS ${{\mathit \ell}}+\not E_T+{}\geq{}$2 j (1,2 ${{\mathit b}}$, 1 forward j)
1  AABOUD 2017T based on 20.2 fb${}^{-1}$ of data. A maximum-likelihood fit to neural-network discriminant distributions is used to separate signal and background events. Individual cross sections are measured as ${\mathit \sigma (}$ ${{\mathit t}}{{\mathit q}}{)}$ = $56.7$ ${}^{+4.3}_{-3.8}$ pb and ${\mathit \sigma (}$ ${{\overline{\mathit t}}}{{\mathit q}}{)}$ = $32.9$ ${}^{+3.0}_{-2.7}$ pb, while their ratio is given by ${\mathit \sigma (}$ ${{\mathit t}}{{\mathit q}}{)}/{\mathit \sigma (}$ ${{\overline{\mathit t}}}{{\mathit q}}{)}$ = $1.72$ $\pm0.09$. A lower limit $\vert \mathit V_{\mathit tb}\vert$ $>$ 0.92 (95$\%$ CL) is obtained. Measured total and differential cross sections are described well by the SM.
2  Based on 19.7 fb${}^{-1}$ of data. The ${{\mathit t}}$ and ${{\overline{\mathit t}}}$ production cross sections are measured separately as $\sigma _{t-ch.}({{\mathit t}}$) = $53.8$ $\pm1.5$ $\pm4.4$ pb and $\sigma _{t-ch.}({{\overline{\mathit t}}}$) = $27.6$ $\pm1.3$ $\pm3.7$ pb, respectively, as well as their ratio ${{\mathit R}}_{t-ch}$ = $\sigma _{t-ch.}({{\mathit t}})/\sigma _{t-ch.}({{\overline{\mathit t}}}$) = $1.95$ $\pm0.10$ $\pm0.19$, in agreement with the SM predictions. Combination with a previous CMS result at $\sqrt {s }$ = 7 TeV [CHATRCHYAN 2012BQ] gives $\vert \mathit V_{\mathit tb}\vert$ = $0.998$ $\pm0.038$ $\pm0.016$. Also obtained is the ratio ${{\mathit R}}_{8/7}$ = $\sigma _{t-ch.}$(8TeV)/$\sigma _{t-ch.}$(7TeV) = $1.24$ $\pm0.08$ $\pm0.12$.
References:
 AABOUD 2017T
EPJ C77 531 Fiducial, Total and Differential Cross-Section Measurements of t-Channel Single Top-Quark Production in ${{\mathit p}}{{\mathit p}}$ Collisions at 8 TeV using Data Collected by the ATLAS Detector
 KHACHATRYAN 2014F
JHEP 1406 090 Measurement of the $\mathit t$-Channel Single-top-Quark Production Cross Section and of the $\vert \mathit V_{\mathit tb}\vert$ CKM Matrix Element in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
 CHATRCHYAN 2012BQ
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