# ${{\boldsymbol Z}}{{\boldsymbol t}}$ Production Cross Section in ${{\boldsymbol p}}{{\boldsymbol p}}$ Collisions at $\sqrt {s }$ = 13 TeV INSPIRE search

VALUE (fb) DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$111$ $\pm13$ ${}^{+11}_{-9}$ 1
 2019 BF
CMS 3${{\mathit \ell}}$ + ${}\geq{}$2j (${}\geq{}1{{\mathit b}}$j)
$600$ $\pm170$ $\pm140$ 2
 2018 AE
ATLS 3${{\mathit \ell}}$ + 1j + 1${{\mathit b}}$j
$123$ ${}^{+33}_{-31}$ ${}^{+29}_{-23}$ 3
 2018 Z
CMS 3${{\mathit \ell}}$ + 1j + 1${{\mathit b}}$j
1  SIRUNYAN 2019BF based on 77.4 fb${}^{-1}$ of data. Two BDT's are used in the analysis: one to discriminate prompt leptons from non-prompt ones; and one to discriminate ${{\mathit t}}{{\mathit Z}}{{\mathit q}}$ signal from backgrounds. The result is for the cross section ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit Z}}{{\mathit q}}$ $\rightarrow$ ${{\mathit t}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit q}}{)}$ for dilepton invariant masses above 30 GeV and is consistent with the NLO SM prediction of $94.2$ $\pm3.1$ fb.
2  AABOUD 2018AE based on 36.1 fb${}^{-1}$ of data. A multivariate analysis is used to separate the signal from the backgrounds. The result is consistent with the NLO SM prediction of $800$ fb with a scale uncertainty of ${}^{+6.1}_{-7.4}\%$.
3  SIRUNYAN 2018Z based on 35.9 fb${}^{-1}$ of data. A multivariate analysis is used to separate the signal from the backgrounds. The result is for the cross section ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit Z}}{{\mathit q}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit q}}{)}$ and is consistent with the NLO SM prediction of $94.2$ ${}^{+1.9}_{-1.8}$(scale)$~\pm2.5$(PDF) fb. Superseded by SIRUNYAN 2019BF.
References:
 SIRUNYAN 2019BF
PRL 122 132003 Observation of Single Top Quark Production in Association with a $Z$ Boson in Proton-Proton Collisions at $\sqrt {s}$ =13 TeV
 AABOUD 2018AE
PL B780 557 Measurement of the production cross-section of a single top quark in association with a Z boson in proton?proton collisions at 13 TeV with the ATLAS detector
 SIRUNYAN 2018Z
PL B779 358 Measurement of the associated production of a single top quark and a Z boson in pp collisions at $\sqrt{s} =$ TeV