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The expected and observed 95\% \CL model-independent upper limits on the product of the cross section and branching fraction $\sigma(\Pg\Pg\to\PA)\mathcal{B}(\PA\to\PZ\Ph\to\ell\ell\PGt\PGt)$ are shown. The green (yellow) band corresponds to the 68 (95)\% confidence intervals for the expected limit.

The reconstructed mass $\mlltt^{\mathrm{c}}$ distribution and uncertainties after a background-only fit in all eight final states. The final states are included as separate distributions in the simultaneous fit; combining them together is for visualization purposes only. The uncertainties include both statistical and systematic components. The expected contribution from the $\PA\to\PZ\Ph$ signal process is shown for a pseudoscalar Higgs boson with $\mA = 300\GeV$ with the product of the cross section and branching fraction of 20\unit{fb} and is for illustration only.

Feynman diagrams for two dominant production processes for the pseudoscalar $\PA$ boson: gluon fusion (left) and associated production with $\cPqb$ quarks (right). In both cases the $\PA$ boson decays into a 125\GeV Higgs boson and a \PZ boson.

Feynman diagrams for two dominant production processes for the pseudoscalar $\PA$ boson: gluon fusion (left) and associated production with $\cPqb$ quarks (right). In both cases the $\PA$ boson decays into a 125\GeV Higgs boson and a \PZ boson.

The reconstructed mass $\mlltt^{\mathrm{c}}$ distributions and uncertainties after a background-only fit for the $\ell\ell+\Pe\tauh$ (upper left), $\ell\ell+\Pgm\tauh$ (upper right), $\ell\ell+\tauh\tauh$ (lower left), and $\ell\ell+\Pe\Pgm$ (lower right) channels. In all cases the two decay channels of the \PZ boson are included as separate distributions in the simultaneous fit; combining them together is for visualization purposes only. The uncertainties include both statistical and systematic components. The expected contribution from the $\PA\to\PZ\Ph$ signal process is shown for a pseudoscalar Higgs boson with $\mA = 300\GeV$ with the product of the cross section and branching fraction of 20\unit{fb} and is for illustration only.

The expected and observed 95\% \CL exclusion limits in the $\mA$--$\tanb$ plane are shown for two MSSM scenarios: $\mathrm{M^{125}_{\Ph,EFT}}$ (left) and hMSSM (right). The area under the solid black curve is excluded. The dashed black curve corresponds to the median expected limit, surrounded by the 68 (95)\% confidence intervals in blue (red). The limits are overlaid on a background showing the $\sigma(\Pg\Pg\to\PA+\bbbar\PA)\mathcal{B}(\PA\to\PZ\Ph\to\ell\ell\PGt\PGt)$ as predicted by each model at each grid point.

The reconstructed mass $\mlltt^{\mathrm{c}}$ distributions and uncertainties after a background-only fit for the $\ell\ell+\Pe\tauh$ (upper left), $\ell\ell+\Pgm\tauh$ (upper right), $\ell\ell+\tauh\tauh$ (lower left), and $\ell\ell+\Pe\Pgm$ (lower right) channels. In all cases the two decay channels of the \PZ boson are included as separate distributions in the simultaneous fit; combining them together is for visualization purposes only. The uncertainties include both statistical and systematic components. The expected contribution from the $\PA\to\PZ\Ph$ signal process is shown for a pseudoscalar Higgs boson with $\mA = 300\GeV$ with the product of the cross section and branching fraction of 20\unit{fb} and is for illustration only.

The reconstructed mass $\mlltt^{\mathrm{c}}$ distributions and uncertainties after a background-only fit for the $\ell\ell+\Pe\tauh$ (upper left), $\ell\ell+\Pgm\tauh$ (upper right), $\ell\ell+\tauh\tauh$ (lower left), and $\ell\ell+\Pe\Pgm$ (lower right) channels. In all cases the two decay channels of the \PZ boson are included as separate distributions in the simultaneous fit; combining them together is for visualization purposes only. The uncertainties include both statistical and systematic components. The expected contribution from the $\PA\to\PZ\Ph$ signal process is shown for a pseudoscalar Higgs boson with $\mA = 300\GeV$ with the product of the cross section and branching fraction of 20\unit{fb} and is for illustration only.

The reconstructed mass $\mlltt^{\mathrm{c}}$ distributions and uncertainties after a background-only fit for the $\ell\ell+\Pe\tauh$ (upper left), $\ell\ell+\Pgm\tauh$ (upper right), $\ell\ell+\tauh\tauh$ (lower left), and $\ell\ell+\Pe\Pgm$ (lower right) channels. In all cases the two decay channels of the \PZ boson are included as separate distributions in the simultaneous fit; combining them together is for visualization purposes only. The uncertainties include both statistical and systematic components. The expected contribution from the $\PA\to\PZ\Ph$ signal process is shown for a pseudoscalar Higgs boson with $\mA = 300\GeV$ with the product of the cross section and branching fraction of 20\unit{fb} and is for illustration only.

The expected and observed 95\% \CL exclusion limits in the $\mA$--$\tanb$ plane are shown for two MSSM scenarios: $\mathrm{M^{125}_{\Ph,EFT}}$ (left) and hMSSM (right). The area under the solid black curve is excluded. The dashed black curve corresponds to the median expected limit, surrounded by the 68 (95)\% confidence intervals in blue (red). The limits are overlaid on a background showing the $\sigma(\Pg\Pg\to\PA+\bbbar\PA)\mathcal{B}(\PA\to\PZ\Ph\to\ell\ell\PGt\PGt)$ as predicted by each model at each grid point.

The distribution of the $\PA$ boson mass for the three studied mass reconstruction methods at 300\GeV: using only the visible decay products ($\mAvis$, orange), using the \textsc{svfit} algorithm ($\mlltt^{\mathrm{fit}}$, green), and using the \textsc{svfit} algorithm with a mass constraint of 125\GeV for the Higgs boson ($\mlltt^{\mathrm{c}}$, blue). The eight final states of the $\PA$ boson decay are combined for visualization purposes.