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Home > Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s} = $ 13 TeV > Plots
 
 
Distribution of the variable \ST for events passing the signal selection for the SM background estimation (stacked filled histograms), data (black points), and different hypotheses of \LQ signals (lines). Upper left: boosted top quark candidate (hadronically decaying top quark reconstructed in the fully or partially merged topology) and exactly one \PQb jet; lower left: boosted top quark candidate and at least two \PQb jets; upper right: resolved top quark candidate (hadronically decaying top quark reconstructed in the resolved topology) and exactly one \PQb jet; lower-right: resolved top quark candidate and at least two \PQb jets. The cross-hatched band in the upper panels represents the total uncertainty (statistical+systematic). The lower panel of each distribution shows the ratio, and its uncertainty, between the observation and the SM expectation.
Distribution of the variable \ST for events passing the signal selection for the SM background estimation (stacked filled histograms), data (black points), and different hypotheses of \LQ signals (lines). Upper left: boosted top quark candidate (hadronically decaying top quark reconstructed in the fully or partially merged topology) and exactly one \PQb jet; lower left: boosted top quark candidate and at least two \PQb jets; upper right: resolved top quark candidate (hadronically decaying top quark reconstructed in the resolved topology) and exactly one \PQb jet; lower-right: resolved top quark candidate and at least two \PQb jets. The cross-hatched band in the upper panels represents the total uncertainty (statistical+systematic). The lower panel of each distribution shows the ratio, and its uncertainty, between the observation and the SM expectation.
Distribution of the variable \ST for events passing the signal selection for the SM background estimation (stacked filled histograms), data (black points), and different hypotheses of \LQ signals (lines). Upper left: boosted top quark candidate (hadronically decaying top quark reconstructed in the fully or partially merged topology) and exactly one \PQb jet; lower left: boosted top quark candidate and at least two \PQb jets; upper right: resolved top quark candidate (hadronically decaying top quark reconstructed in the resolved topology) and exactly one \PQb jet; lower-right: resolved top quark candidate and at least two \PQb jets. The cross-hatched band in the upper panels represents the total uncertainty (statistical+systematic). The lower panel of each distribution shows the ratio, and its uncertainty, between the observation and the SM expectation.
Distribution of the variable \ST for events passing the signal selection for the SM background estimation (stacked filled histograms), data (black points), and different hypotheses of \LQ signals (lines). Upper left: boosted top quark candidate (hadronically decaying top quark reconstructed in the fully or partially merged topology) and exactly one \PQb jet; lower left: boosted top quark candidate and at least two \PQb jets; upper right: resolved top quark candidate (hadronically decaying top quark reconstructed in the resolved topology) and exactly one \PQb jet; lower-right: resolved top quark candidate and at least two \PQb jets. The cross-hatched band in the upper panels represents the total uncertainty (statistical+systematic). The lower panel of each distribution shows the ratio, and its uncertainty, between the observation and the SM expectation.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQS\ALQS)$ (upper), $\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQS\ALQS)+\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQS. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO, except for pair-produced \LQS, for which NLO values are used based on NLO quantum chromodynamics corrections~\cite{Kramer:2004df} and the model implementation in Ref.~\cite{Dorsner:2018ynv}.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQS\ALQS)$ (upper), $\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQS\ALQS)+\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQS. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO, except for pair-produced \LQS, for which NLO values are used based on NLO quantum chromodynamics corrections~\cite{Kramer:2004df} and the model implementation in Ref.~\cite{Dorsner:2018ynv}.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQS\ALQS)$ (upper), $\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQS\ALQS)+\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQS. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO, except for pair-produced \LQS, for which NLO values are used based on NLO quantum chromodynamics corrections~\cite{Kramer:2004df} and the model implementation in Ref.~\cite{Dorsner:2018ynv}.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQS\ALQS)$ (upper), $\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQS\ALQS)+\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQS. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO, except for pair-produced \LQS, for which NLO values are used based on NLO quantum chromodynamics corrections~\cite{Kramer:2004df} and the model implementation in Ref.~\cite{Dorsner:2018ynv}.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQS\ALQS)$ (upper), $\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQS\ALQS)+\sigma(\Pp\Pp\to\nu\LQS)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQS. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO, except for pair-produced \LQS, for which NLO values are used based on NLO quantum chromodynamics corrections~\cite{Kramer:2004df} and the model implementation in Ref.~\cite{Dorsner:2018ynv}.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 0$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 0$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 0$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 0$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 0$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 1$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 1$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 1$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 1$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected (solid and dotted black lines) 95\% \CL upper limits on $\sigma(\Pp\Pp\to\LQV\ALQV)$ (upper), $\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (middle left and right), and $\sigma(\Pp\Pp\to\LQV\ALQV)+\sigma(\Pp\Pp\to\tau\LQV)$ with $\lambda = 1.5$ and $2.5$ (lower left and right), as a function of the mass of the \LQV, with $k = 1$. The limits apply under the assumption of equal couplings for the \LQ decay to each of the two allowed lepton flavor pairings. The bands represent the one- and two-standard deviation variations of the expected limit. The solid blue curve indicates the theoretical predictions at LO.
The observed and expected 95\% \CL \LQ exclusion limits in the plane of the \LQ-lepton-quark coupling and the mass of the \LQ for single (brown lines) and pair (blue lines) production, and considering their sum (black lines). Regions to the left of the lines are excluded. The upper plot pertains to an \LQS with equal couplings to $\PQt\tau$ and $\PQb\nu$, while the lower plots are for an \LQV assuming $k = 0$ (left) and 1 (right) and equal couplings to $\PQt\nu$ and $\PQb\tau$. For \LQV, the gray area shows the band preferred (95\% \CL) by the \PB\ physics anomalies: $\lambda = C m_{\mathrm{LQ}}$, where $C = \sqrt{0.7 \pm 0.2} \TeV^{-1}$ and $m_{\mathrm{LQ}}$ is expressed in \TeVns~\cite{Buttazzo:2017ixm}.
The observed and expected 95\% \CL \LQ exclusion limits in the plane of the \LQ-lepton-quark coupling and the mass of the \LQ for single (brown lines) and pair (blue lines) production, and considering their sum (black lines). Regions to the left of the lines are excluded. The upper plot pertains to an \LQS with equal couplings to $\PQt\tau$ and $\PQb\nu$, while the lower plots are for an \LQV assuming $k = 0$ (left) and 1 (right) and equal couplings to $\PQt\nu$ and $\PQb\tau$. For \LQV, the gray area shows the band preferred (95\% \CL) by the \PB\ physics anomalies: $\lambda = C m_{\mathrm{LQ}}$, where $C = \sqrt{0.7 \pm 0.2} \TeV^{-1}$ and $m_{\mathrm{LQ}}$ is expressed in \TeVns~\cite{Buttazzo:2017ixm}.
The observed and expected 95\% \CL \LQ exclusion limits in the plane of the \LQ-lepton-quark coupling and the mass of the \LQ for single (brown lines) and pair (blue lines) production, and considering their sum (black lines). Regions to the left of the lines are excluded. The upper plot pertains to an \LQS with equal couplings to $\PQt\tau$ and $\PQb\nu$, while the lower plots are for an \LQV assuming $k = 0$ (left) and 1 (right) and equal couplings to $\PQt\nu$ and $\PQb\tau$. For \LQV, the gray area shows the band preferred (95\% \CL) by the \PB\ physics anomalies: $\lambda = C m_{\mathrm{LQ}}$, where $C = \sqrt{0.7 \pm 0.2} \TeV^{-1}$ and $m_{\mathrm{LQ}}$ is expressed in \TeVns~\cite{Buttazzo:2017ixm}.


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