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CMS-PAS-HIG-18-023
Search for a heavy pseudoscalar Higgs boson decaying into a 125 GeV Higgs boson and a Z boson in final states of two light leptons and two tau leptons at $\sqrt{s}= $ 13 TeV
Abstract: A search is performed for a pseudoscalar Higgs boson, A, decaying into a standard model-like Higgs boson h and a Z boson. The standard model-like Higgs boson is specifically targeted in its decay into a pair of tau leptons, while the Z boson decays leptonically. A data sample of proton-proton collisions collected at $\sqrt{s} = $ 13 TeV by the CMS experiment at the LHC is used, and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. In the absence of observing the signal, model-independent and model-dependent limits are set. The model-dependent limits are set in two minimal supersymmetric standard model benchmark scenarios in the $m_{\mathrm{A}}$-$\tan\beta$ plane.
Figures & Tables Summary Additional Figures References CMS Publications
Figures

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Figure 1:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distributions and uncertainties after a background-only fit for (upper left) $\ell \ell + {\mathrm {e}} {{\tau} _\mathrm {h}} $, (upper right) $\ell \ell + {{\mu}} {{\tau} _\mathrm {h}} $, (lower left) $\ell \ell + {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $, and (lower right) $\ell \ell + {\mathrm {e}} {{\mu}}$. In all cases the two decay channels of the Z boson are each 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 contribution from the AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 1-a:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties after a background-only fit for $\ell \ell + {\mathrm {e}} {{\tau} _\mathrm {h}} $. The two decay channels of the Z boson are each 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 contribution from the AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 1-b:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties after a background-only fit for $\ell \ell + {{\mu}} {{\tau} _\mathrm {h}} $. The two decay channels of the Z boson are each 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 contribution from the AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 1-c:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties after a background-only fit for $\ell \ell + {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $. The two decay channels of the Z boson are each 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 contribution from the AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 1-d:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties after a background-only fit for $\ell \ell + {\mathrm {e}} {{\mu}}$. The two decay channels of the Z boson are each 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 contribution from the AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 2:
Reconstructed mass $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties after a background-only fit in all eight final states. The final states are each 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 contribution from the AZh yield is the number of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb and is for illustration only.

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Figure 3:
The expected and observed 95% CL model-independent limits are shown for the product of the cross section and branching fraction for the studied process: $\sigma \left ({\mathrm {g}} {\mathrm {g}} {\text {A}} \right)\mathcal {B}\left ({\text {A}} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$. The green (yellow) bands correspond to the 68% (95%) confidence intervals for the expected limit.

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Figure 4:
The expected and observed 95% CL exclusion limits in the $ m_{\text {A}} $-$ {\tan\beta} $ plane are shown for two MSSM scenarios: (left) Low ${\tan\beta}$ and (right) hMSSM. The excluded region is the lower $ m_{\text {A}} $ and lower $ {\tan\beta} $ phase space. The limits are overlaid on a background showing the theorized $\sigma \left ({\mathrm {g}} {\mathrm {g}} {\text {A}} + {\mathrm {b}} {\mathrm {b}} {\text {A}} \right)\mathcal {B}\left ({\text {A}} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$ at each grid point.

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Figure 4-a:
The expected and observed 95% CL exclusion limits in the $ m_{\text {A}} $-$ {\tan\beta} $ plane are shown for the Low ${\tan\beta}$ scenario. The excluded region is the lower $ m_{\text {A}} $ and lower $ {\tan\beta} $ phase space. The limits are overlaid on a background showing the theorized $\sigma \left ({\mathrm {g}} {\mathrm {g}} {\text {A}} + {\mathrm {b}} {\mathrm {b}} {\text {A}} \right)\mathcal {B}\left ({\text {A}} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$ at each grid point.

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Figure 4-b:
The expected and observed 95% CL exclusion limits in the $ m_{\text {A}} $-$ {\tan\beta} $ plane are shown for the hMSSM scenario. The excluded region is the lower $ m_{\text {A}} $ and lower $ {\tan\beta} $ phase space. The limits are overlaid on a background showing the theorized $\sigma \left ({\mathrm {g}} {\mathrm {g}} {\text {A}} + {\mathrm {b}} {\mathrm {b}} {\text {A}} \right)\mathcal {B}\left ({\text {A}} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$ at each grid point.
Tables

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Table 1:
Trigger and offline selection requirements for Z boson decay modes. The events are selected with either a lower-$ {p_{\mathrm {T}}} $ threshold double lepton trigger or a higher-$ {p_{\mathrm {T}}} $ threshold single lepton trigger. The subscripts 1 and 2 stand for the higher-$ {p_{\mathrm {T}}} $ and lower-$ {p_{\mathrm {T}}} $ leptons associated with the Z boson, respectively.

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Table 2:
Kinematic selection requirements for each A boson channel, applied on top of the looser selections and b jet veto described in text, with the exception that muons associated to the Z boson must also pass the identification requirement with $ > $ 99% efficiency. The identification (and isolation) requirements are described by $\epsilon _{\mathrm {id.}}^{\ell}$ that stands for efficiency for given lepton type. The leptons assigned to the SM-like Higgs boson are required to have opposite charge. To increase the sensitivity, we require $ m_{{\tau} {\tau}} ^{\mathrm {fit}}$ to be within 90-180 GeV. In the $\ell \ell + {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $ channel we additionally require $ {L_{\text {T}}^{\text {h}}} > $ 60 GeV.

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Table 3:
Sources of systematic uncertainty. The sign $\dagger $ marks the uncertainties that affect both the shape and normalization of the final $ m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distributions. Uncertainties that only affect the normalizations have no marker. For the shape and normalization uncertainties, the magnitude column lists an approximation of the associated change in normalization.

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Table 4:
Background and signal expectations together with the numbers of observed events, for the signal region distributions after a background-only fit. The AZh yields are the numbers of expected signal events for a pseudoscalar Higgs boson with $ m_{\text {A}} = $ 300 GeV with the product of the cross section and branching fraction of 20 fb. The background uncertainty accounts for all sources of background uncertainty, systematic as well as statistical, after the simultaneous fit.
Summary
A search is presented for a pseudoscalar Higgs boson decaying into a standard model-like Higgs boson that further decays into tau leptons and a leptonically decaying Z boson. A data sample of proton-proton collisions collected at $\sqrt{s} = $ 13 TeV by the CMS experiment at the LHC is used, and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The sensitivity of the study is increased by using the information on the standard model-like Higgs boson mass from the previous mass measurements when reconstructing the mass of the pseudoscalar Higgs boson. The signal extraction is further optimized with kinematic selections based on the mass of the standard model-like Higgs boson. In the absence of observing the signal, model-independent limits are set. Model-dependent exclusion limits are set in the ${m_\text{A}} $-${\tan\beta}$ plane for two distinct Minimal supersymmetric standard model scenarios, Low ${\tan\beta}$ and hMSSM. This analysis brings complementary sensitivity to analyses excluding ${m_\text{A}} $-${\tan\beta}$ phase space at high ${\tan\beta}$ values by adding exclusion power at low ${\tan\beta}$ values.
Additional Figures

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Additional Figure 1:
Reconstructed mass $m_{\ell \ell {\tau} {\tau}}^{\mathrm {fit}}$ distribution and uncertainties before a background-only fit is performed simultaneously in all eight final states. All signal region selections except the requirement for the SM-like Higgs boson mass $m_{{\tau} {\tau}}^{\mathrm {fit}}$ to be within 90-180\ GeV were applied. The eight final states are combined together only for visualization purposes. The uncertainties include both statistical and systematic components. The contribution from the AZh yield is the number of expected signal events for a pseudoscalar Higgs boson with $m_{\text {A}} = $ 300 GeV with a cross section times branching fraction of 20 fb.

png pdf
Additional Figure 2:
Reconstructed mass $m_{\ell \ell {\tau} {\tau}}^{\mathrm {c}}$ distribution and uncertainties before a background-only fit is performed simultaneously in all eight final states. All signal region selections except the requirement for the SM-like Higgs boson mass $m_{{\tau} {\tau}}^{\mathrm {fit}}$ to be within 90-180 GeV were applied. The eight final states are combined together only for visualization purposes. The uncertainties include both statistical and systematic components. The contribution from the AZh yield is the number of expected signal events for a pseudoscalar Higgs boson with $m_{\text {A}} = $ 300 GeV with a cross section times branching fraction of 20 fb.

png pdf
Additional Figure 3:
The expected and observed 95% CL exclusion limits in the $m_{\text {A}}$-$\tan\beta $ plane are shown for the Low $\tan\beta $ scenario when only the gluon fusion production process is included. The excluded region is the lower $m_{\text {A}}$ and lower $\tan\beta $ phase space. The limits are overlaid on a background showing the theorized $\sigma \left ({\mathrm {g}} {\mathrm {g}} \text {A}\right)\mathcal {B}\left (\text {A} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$ at each grid point.

png pdf
Additional Figure 4:
The expected and observed 95% CL exclusion limits in the $m_{\text {A}}$-$\tan\beta $ plane are shown for the hMSSM scenario when only the gluon fusion production process is included. The excluded region is the lower $m_{\text {A}}$ and lower $\tan\beta $ phase space. The limits are overlaid on a background showing the theorized $\sigma \left ({\mathrm {g}} {\mathrm {g}} \text {A}\right)\mathcal {B}\left (\text {A} \to {\mathrm {Z}} {\mathrm {h}} \to \ell \ell \tau \tau \right)$ at each grid point.
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