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Search for higgsinos decaying to two Higgs bosons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The collaboration
CMS-SUS-20-004, 2022.

Abstract (data abstract)
Results are presented from a search for physics beyond the standard model in proton-proton collisions at $\sqrt{s}=13$ TeV in channels with two Higgs bosons, each decaying via the process H$\to b\overline{b}$, and large missing transverse momentum. The search uses a data sample corresponding to an integrated luminosity of 137 fb$^{-1}$ collected by the CMS experiment at the CERN LHC. The search is motivated by models of supersymmetry that predict the production of neutralinos, the neutral partners of the electroweak gauge and Higgs bosons. The observed event yields in the signal regions are found to be consistent with the standard model background expectations. The results are interpreted using simplified models of supersymmetry. For the electroweak production of nearly degenerate higgsinos, each of whose decay chains yields a neutralino ($\widetilde{\chi}^0_1$) that in turn decays to a massless goldstino and a Higgs boson, $\widetilde{\chi}^0_1$ masses in the range 175 to 1025 GeV are excluded at 95\% confidence level. For the strong production of gluino pairs decaying via a slightly lighter $\widetilde{\chi}^0_2$ to H and a light $\widetilde{\chi}^0_1$, gluino masses below 2330 GeV are excluded.

• #### Results

Data from Figure 10

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Predicted background and observed yields vs bin index

• #### Xsec limits, TChiHH-G

Data from Figure 11

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Cross section 95% CL upper limit vs m($\widetilde{\chi}^0_1$) for SMS model TChiHH-G.

• #### TChiHH-G_th

Data from Figure 11

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Theory cross sections vs m($\widetilde{\chi}^0_1$) for SMS model TChiHH-G.

• #### TChiHH-G_th_N1N2

Data from Figure 11

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Theory cross sections vs m($\widetilde{\chi}^0_1$) for SMS model TChiHH-G, $\widetilde{\chi}^0_1, \widetilde{\chi}^0_2$ NLSPs only.

• #### Xsec limits, TChiHH

Data from Figure 13.

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The 95% CL observed and expected upper limits on the production cross sections of the TChiHH signal model as a...

• #### TChiHH observed mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### TChiHH observed + 1 s.d.(theory) mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### TChiHH expected mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### TChiHH expected + 1 s.d. mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### TChiHH expected + 2 s.d. mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### TChiHH expected - 1 s.d. mass limit curve

Data from Figure 13.

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Exclusion limits assuming the approximate-NNLO+NNLL cross sections

• #### Xsec limits, T5HH

Data from Figure 14

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Cross section, 95% CL upper limit plus theory vs m($\widetilde{g}$) for SMS model T5HH.

• #### Covariance matrix

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Pre-fit background covariance matrix $\sigma_{xy}$ for the 22 analysis bins, ordered as in Fig. 10.

• #### Correlation matrix

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Pre-fit background correlation matrix $\rho_{xy}$ for the 22 analysis bins, ordered as in Fig. 10.

• #### Significance, TChiHH

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Significance vs $(m(\widetilde{\chi}^0_2), m(\widetilde{\chi}^0_1))$ for SMS model TChiHH.

• #### Significance, T5HH

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Significance vs $m(\widetilde{g})$ for SMS model T5HH.

• #### Efficiency, TChiHH-G

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Efficiency vs $m(\widetilde{\chi}^0_1)$ for SMS model TChiHH-G, $\mathcal{B}(\mathrm{H}$-->$\mathrm{b}\overline{\mathrm{b}})=100\%$.

• #### Efficiency, T5HH

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Efficiency vs $m(\widetilde{g})$ for SMS model T5HH.

• #### Efficiency, TChiHH

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Efficiency vs $(m(\widetilde{\chi}^0_2), m(\widetilde{\chi}^0_1))$ for SMS model TChiHH.

• #### Signal and control region yields for resolved signature

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Signal and control region populations for the resolved signature.

• #### Signal and control region yields for boosted signature

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Signal and control region populations for the boosted signature.

• #### Cut flow for resolved signature, TChHH-G and TChiHH models

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Cut flow table for the resolved topology showing expected event yields at 137 fb$^{-1}$ for selected signal models as successive...

• #### Cut flow for boosted signature, T5HH model

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Cut flow table for the boosted topology showing expected event yields at 137 fb$^{-1}$ for selected signal model points as...