CERN Accelerating science

Illustrative leading-order Feynman diagram of single vector-like $T$ production in association with a $t$ or $b$ quark and subsequent decay into either $Ht$ or $Zt$.

:

: Observed (solid line) and expected (dashed line) 95\% CL upper limits on the total cross-section $\sigma(pp \to T \to Ht/Zt)$ as a function of \VLTa mass in the \SU2 singlet representation assuming \protect\subref{fig:lims-K030-singlet} $\kappa=0.3$ and \protect\subref{fig:lims-K050-singlet} $\kappa=0.5$. The surrounding shaded bands correspond to 1 and 2 standard deviations around the expected limit. A vertical dashed line is drawn to indicate the lower edge of the region with $\RW > 50\% $ for which the theoretical calculations are no longer valid. The expected limits for the individual analyses are shown. The \HTZT analysis is only included in the limit calculation for $\MT < 2.1$~TeV. The red line shows the NLO theoretical cross-section prediction, with the surrounding shaded band representing the corresponding uncertainty. : Caption not extracted

:

: Observed (solid line) and expected (dashed line) 95\% CL upper limits on the total cross-section $\sigma(pp \to T \to Ht/Zt)$ as a function of \VLTa mass in the \SU2 doublet representation assuming \protect\subref{fig:Lims-K030-doublet} $\kappa=0.3$ and \protect\subref{fig:Lims-K050-doublet} $\kappa=0.5$. The surrounding shaded bands correspond to 1 and 2 standard deviations around the expected limit. A vertical dashed line is drawn to indicate the lower edge of the region with $\RW > 50\% $ for which the theoretical calculations are no longer valid. The expected limits for \HTZT and \OSML analyses are shown; the \MONO analysis is not shown due to substantially less sensitivity in this scenario. However, the \MONO analysis is included in the combined limit calculation. The \HTZT analysis is only included in the limit calculation for $\MT < 2.1$~TeV. The red line shows the NLO theoretical cross-section prediction, with the surrounding shaded band representing the corresponding uncertainty. : Caption not extracted

:

: \protect\subref{fig:XSLims-Obs-singlet} Observed and \protect\subref{fig:XSLims-Exp-singlet} expected 95\% CL exclusion limits on the total cross-section $\sigma(pp \to T \to Ht/Zt)$ as a function of the universal coupling constant $\kappa$ and the \VLTa mass in the \SU2 singlet representation. All values of $\kappa$ above the white contour line are excluded at each mass point. Limits are only presented in the regime $\RW < 50\%$, where the theory calculations are known to be valid. : Caption not extracted

:

: \protect\subref{fig:XSLims-Obs-doublet} Observed and \protect\subref{fig:XSLims-Exp-doublet} expected 95\% CL exclusion limits on the total cross-section $\sigma(pp \to T \to Ht/Zt)$ as a function of the universal coupling constant $\kappa$ and the $T$ quark mass in the \SU2 doublet representation. All values of $\kappa$ above the white contour line are excluded at each mass point. Limits are only presented in the regime $\RW < 50\%$, where the theory calculations are known to be valid. : Caption not extracted

:

: Observed (solid line) and expected (dashed line) 95\% CL exclusion limits on the universal coupling constant $\kappa$ as a function of the $T$ quark mass in the \protect\subref{fig:MKLims-singlet} \SU2 singlet and \protect\subref{fig:MKLims-doublet} \SU2 doublet representations for the combination. All values of $\kappa$ above the black contour lines are excluded at each mass point. The shaded bands correspond to 1 and 2 standard deviations around the expected limit. Also shown are the expected limits for the individual analyses. The gray dashed lines represent configurations of $(\MT, \kappa)$ resulting in equal values of the relative resonance width $\RW$. Limits are only presented in the regime $\RW < 50\%$, where the theory calculations are known to be valid. : Caption not extracted

:

: \protect\subref{fig:Obs-GammaBR} Observed and \protect\subref{fig:Exp-GammaBR} expected upper limits at 95\% CL on the $T$-quark mass as a function of the relative resonance width ($\RW$) and the relative coupling parameter $\xi_W$, for the assumption $\xi_Z=\xi_W$. The values $\xi_W=0.5$ and $\xi_W=0.0$ correspond to the \SU2 singlet and \SU2 doublet representations, respectively. The dashed contour lines denote exclusion limits of equal mass in units of TeV. : Caption not extracted