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Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Feynman diagrams of $\Zprime \to \Pgmm \Pgmp$ with a $\Zprime$ boson produced via $\PQb \PAQb \to \Zprime$ or $\PQs \PAQb \to \Zprime$, with at least one $\PQb$ quark in the final state. While a $\Zprime\PQb\PQb$ coupling may be present in any generic model, a $\Zprime\PQs\PQb$ coupling could arise through flavor mixing between the second- and third-generation quarks.

Distribution of \minmlb as obtained from simulation in events with $\Nb\geq1$ passing all the other selection requirements. In this search, we require $\minmlb>175\GeV$. The stacked histogram displays the expected distribution from the simulation of the SM backgrounds, while the overlaid open histograms illustrate the size and shape of the \Zprime contribution from the LFU model described in \Eq{eq:LFUlagrangian}, for several \Zprime mass hypotheses. For illustrative purposes, we choose couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$. The contribution of background processes other than DY and \ttbar is so small that it is only barely visible at the bottom of the stacked histogram. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples (Section~\ref{sec:MC}). Histograms are normalized to unit area.

Distribution of \minmlb as obtained from simulation in events with $\Nb\geq1$ passing all the other selection requirements. In this search, we require $\minmlb>175\GeV$. The stacked histogram displays the expected distribution from the simulation of the SM backgrounds, while the overlaid open histograms illustrate the size and shape of the \Zprime contribution from the LFU model described in \Eq{eq:LFUlagrangian}, for several \Zprime mass hypotheses. For illustrative purposes, we choose couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$. The efficiency of the requirement on the \Zprime signal process is about 30\%, 70\%, and 85\% for $\mZp=400$, $1000$, and $2000\GeV$, respectively. The contribution of background processes other than DY and \ttbar is so small that it is only barely visible at the bottom of the stacked histogram. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples (Section~\ref{sec:MC}). Histograms are normalized to unit area.

Distributions of \mmumu in the $\Nb=1$ (left) and $\Nb\geq2$ (right) event categories. The stacked histogram displays the expected distribution from the SM background simulation. The overlaid open distributions illustrate the \Zprime contribution from the LFU model at $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$ for a variety of \Zprime mass hypotheses. The observed data are shown as black points with statistical error bars. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples. The size of the bins increases as a function of \mmumu. In extracting the results of the search, the background is estimated directly from data, so the SM background simulation is only illustrative in these distributions.

Distributions of \mmumu in the $\Nb=1$ (left) and $\Nb\geq2$ (right) event categories. The stacked histogram displays the expected distribution from the SM background simulation. The overlaid open distributions illustrate the \Zprime contribution from the LFU model at $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$ for a variety of \Zprime mass hypotheses. The observed data are shown as black points with statistical error bars. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples. The size of the bins increases as a function of \mmumu. In extracting the results of the search, the background is estimated directly from data, so the SM background simulation is only illustrative in these distributions.

Distributions of \mmumu in the $\Nb=1$ (left) and $\Nb\geq2$ (right) event categories. The stacked histogram displays the expected distribution from the SM background simulation. The overlaid open distributions illustrate the \Zprime contribution from the LFU model at $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$ for a variety of \Zprime mass hypotheses. The observed data are shown as black points with statistical error bars. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples. The size of the bins increases as a function of \mmumu. In extracting the results of the search, the background is estimated directly from data, so the SM background simulation is only illustrative in these distributions.

Distributions of \mmumu in the $\Nb=1$ (left) and $\Nb\geq2$ (right) event categories. The stacked histogram displays the expected distribution from the SM background simulation. The overlaid open distributions illustrate the \Zprime contribution from the LFU model at $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$ for a variety of \Zprime mass hypotheses. The observed data are shown as black points with statistical error bars. The hatched region indicates the statistical uncertainty arising from the limited size of the SM simulated samples. The size of the bins increases as a function of \mmumu. In extracting the results of the search, the background is estimated directly from data, so the SM background simulation is only illustrative in these distributions.

Invariant mass \mmumu distributions in the $\Nb=1$ (left) and $\Nb\geq2$ (right) categories, shown together with the corresponding selected background functional forms used as input to the \textit{discrete profiling} method~\cite{Dauncey:2014xga} when probing the $\mZp=500\GeV$ hypothesis. The expected signal distribution for the LFU model described in \Eq{eq:LFUlagrangian}, with couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$, is overlaid. The displayed mass range corresponds to the fit window used for this \mZp hypothesis, which is ${\pm} 10\, \sigma_{\text{mass}}$ around the probed \mZp value. While the likelihood fits are performed on unbinned data, here we present the data in binned histograms with binning chosen to reflect the size of $\sigma_{\text{mass}}$.

Invariant mass \mmumu distributions in the $\Nb=1$ (left) and $\Nb\geq2$ (right) categories, shown together with the corresponding selected background functional forms used as input to the \textit{discrete profiling} method~\cite{Dauncey:2014xga} when probing the $\mZp=500\GeV$ hypothesis. The expected signal distribution for the LFU model described in \Eq{eq:LFUlagrangian}, with couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$, is overlaid. The displayed mass range corresponds to the fit window used for this \mZp hypothesis, which is ${\pm} 10\, \sigma_{\text{mass}}$ around the probed \mZp value. While the likelihood fits are performed on unbinned data, here we present the data in binned histograms with binning chosen to reflect the size of $\sigma_{\text{mass}}$.

Invariant mass \mmumu distributions in the $\Nb=1$ (left) and $\Nb\geq2$ (right) categories, shown together with the corresponding selected background functional forms used as input to the \textit{discrete profiling} method~\cite{Dauncey:2014xga} when probing the $\mZp=500\GeV$ hypothesis. The expected signal distribution for the LFU model described in \Eq{eq:LFUlagrangian}, with couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$, is overlaid. The displayed mass range corresponds to the fit window used for this \mZp hypothesis, which is ${\pm} 10\, \sigma_{\text{mass}}$ around the probed \mZp value. While the likelihood fits are performed on unbinned data, here we present the data in binned histograms with binning chosen to reflect the size of $\sigma_{\text{mass}}$.

Invariant mass \mmumu distributions in the $\Nb=1$ (left) and $\Nb\geq2$ (right) categories, shown together with the corresponding selected background functional forms used as input to the \textit{discrete profiling} method~\cite{Dauncey:2014xga} when probing the $\mZp=500\GeV$ hypothesis. The expected signal distribution for the LFU model described in \Eq{eq:LFUlagrangian}, with couplings $\abs{\gl} = \abs{g_{\PGn}} = \abs{\gb} = 0.03$ and $\delta_{\PQb\PQs}=0$, is overlaid. The displayed mass range corresponds to the fit window used for this \mZp hypothesis, which is ${\pm} 10\, \sigma_{\text{mass}}$ around the probed \mZp value. While the likelihood fits are performed on unbinned data, here we present the data in binned histograms with binning chosen to reflect the size of $\sigma_{\text{mass}}$.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Exclusion limits at 95\%~\CL on the number of selected BSM events with $\Nb \geq 1$ as functions of \mZp for the different representative values of $f_{2\PQb}=0$ (upper left), $0.25$ (upper right), $0.75$ (lower left), and $1$ (lower right). The quantity $f_{2\PQb}$ is the fraction of BSM events passing the analysis selection that have at least two \PQb quark jets. The solid black (dashed red) curve represents the observed (median expected) exclusion. The inner green (outer yellow) band indicates the region containing 68 (95)\% of the distribution of limits expected under the background-only hypothesis.

Observed (solid) and median expected (dashed) exclusion limits at 95\%~\CL in the $\abs{\gb}$--$\abs{\gl}$ plane for the LFU model. The scenarios considered have $\abs{\delta_{\PQb\PQs}}$ values of either 0 (left) or 0.25 (right). In all cases, we assume $\abs{g_{\PGn}} = \abs{\gl}$. The exclusion limits are given up to coupling values at which the $\Zprime$ width is equal to half of the $\Pgm\Pgm$ invariant mass resolution, marked by the dotted curves. Beyond these coupling values, the narrow width approximation intrinsic to the search strategy is not considered valid. The enclosed regions are excluded.

Observed (solid) and median expected (dashed) exclusion limits at 95\%~\CL in the $\abs{\gb}$--$\abs{\gl}$ plane for the LFU model. The scenarios considered have $\abs{\delta_{\PQb\PQs}}$ values of either 0 (left) or 0.25 (right). In all cases, we assume $\abs{g_{\PGn}} = \abs{\gl}$. The exclusion limits are given up to coupling values at which the $\Zprime$ width is equal to half of the $\Pgm\Pgm$ invariant mass resolution, marked by the dotted curves. Beyond these coupling values, the narrow width approximation intrinsic to the search strategy is not considered valid. The enclosed regions are excluded. For $\abs{\delta_{\PQb\PQs}}=0.25$ and $\mZp=2\TeV$, no region of the parameter space is expected to be excluded.

Observed (solid) and median expected (dashed) exclusion limits at 95\%~\CL in the $\abs{\gb}$--$\abs{\gl}$ plane for the LFU model. The scenarios considered have $\abs{\delta_{\PQb\PQs}}$ values of either 0 (left) or 0.25 (right). In all cases, we assume $\abs{g_{\PGn}} = \abs{\gl}$. The exclusion limits are given up to coupling values at which the $\Zprime$ width is equal to half of the $\Pgm\Pgm$ invariant mass resolution, marked by the dotted curves. Beyond these coupling values, the narrow width approximation intrinsic to the search strategy is not considered valid. The enclosed regions are excluded.

Observed (solid) and median expected (dashed) exclusion limits at 95\%~\CL in the $\abs{\gb}$--$\abs{\gl}$ plane for the LFU model. The scenarios considered have $\abs{\delta_{\PQb\PQs}}$ values of either 0 (left) or 0.25 (right). In all cases, we assume $\abs{g_{\PGn}} = \abs{\gl}$. The exclusion limits are given up to coupling values at which the $\Zprime$ width is equal to half of the $\Pgm\Pgm$ invariant mass resolution, marked by the dotted curves. Beyond these coupling values, the narrow width approximation intrinsic to the search strategy is not considered valid. The enclosed regions are excluded. For $\abs{\delta_{\PQb\PQs}}=0.25$ and $\mZp=2\TeV$, no region of the parameter space is expected to be excluded.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\ttwothree}$--$\abs{\gZp}$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod}, for representative values of $\mZp=500\GeV$ (upper left), $\mZp=1\TeV$ (upper right), $\mZp=1.5\TeV$ (lower left), and $\mZp=2\TeV$ (lower right). The solid black (dashed red) curves represent the observed (median expected) exclusions. The dotted curves denote the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. For a given mass, the region enclosed between the solid black (dashed red) and dotted curves is (expected to be) excluded. The dotted curve for $\mZp = 500\GeV$ lies beyond the displayed $\abs{\gZp}$ range and is, therefore, not shown. The shaded blue area represents the region preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL. The region above the green dash-dotted curve is incompatible at 95\%~\CL with the measurement of the mass difference between the mass eigenstates of the neutral \PBs mesons~\cite{ParticleDataGroup:2022pth}.

Exclusion limits at 95\%~\CL in the $\abs{\gZp}$--$\mZp$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod} for a fixed value of $\ttwothree=0$. The solid black (dashed red) curve represents the observed (median expected) exclusion. The dotted curve denotes the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. The region enclosed between the solid black (dashed red) and the dotted curves is (expected to be) excluded. The shaded blue area represents the $\abs{\gZp}$ range preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL.

Exclusion limits at 95\%~\CL in the $\abs{\gZp}$--$\mZp$ plane for the $B_{3}\!-\!L_{2}$ model~\cite{Allanach:2022iod} for a fixed value of $\ttwothree=0$. The solid black (dashed red) curve represents the observed (median expected) exclusion. The dotted curve denotes the coupling values at which the \Zprime width equals one half of the $\Pgm\Pgm$ invariant mass resolution. For larger values of the couplings, the narrow width approximation intrinsic to the search strategy is not considered valid. The region enclosed between the solid black (dashed red) and the dotted curves is (expected to be) excluded. The shaded blue area represents the $\abs{\gZp}$ range preferred from the global fit in Ref.~\cite{Allanach:2022iod} at 95\%~\CL.