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Search for exotic decays of the Higgs boson into b$\overline{b}$ and missing transverse momentum in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The collaboration
JHEP 01 (2022) 063, 2022.

Abstract (data abstract)
CERN-LHC, ATLAS. A search for the exotic decay of the Higgs boson ($H$) into a $b\bar{b}$ resonance plus missing transverse momentum is described. The search is performed with the ATLAS detector at the Large Hadron Collider using $139\; \mathrm{fb}^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV. The search targets events from $ZH$ production in an NMSSM scenario where $H \rightarrow\tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0}$, with $\tilde{\chi}_{2}^{0} \rightarrow a \tilde{\chi}_{1}^{0}$, where $a$ is a light pseudoscalar Higgs boson and $\tilde{\chi}^{0}_{1,2}$ are the two lightest neutralinos. The decay of the $a$ boson into a pair of $b$-quarks results in a peak in the dijet invariant mass distribution. The final-state signature consists of two leptons, two or more jets, at least one of which is identified as originating from a $b$-quark, and missing transverse momentum. Observations are consistent with Standard Model expectations and upper limits are set on the product of cross section times branching ratio for a three-dimensional scan of the masses of the $\tilde\chi_{2}^{0}$, $\tilde{\chi}_{1}^{0}$ and $a$ boson.

• #### Figure 1a Dijet invariant mass

Figure 1a in the paper

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Distribution of the dijet invariant mass in CRZ. The Z+HF and $t\bar{t}$ scale factors, described in the text, have been...

• #### Figure 1b $E_{\text{T}}^{\text{miss}}$

Figure 1b in the paper

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Distribution of the missing transverse energy in VRMET. The Z+HF and $t\bar{t}$ scale factors, described in the text, have been...

• #### Figure 1c Dijet invariant mass

Figure 1c in the paper

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Distribution of the dijet invariant mass in CRTop. The Z+HF and $t\bar{t}$ scale factors, described in the text, have been...

• #### Figure 1d $E_{\text{T}}^{\text{miss}}$

Figure 1d in the paper

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Distribution of the missing transverse energy in CRTop. The Z+HF and $t\bar{t}$ scale factors, described in the text, have been...

• #### Figure 2 Dijet invariant mass

Figure 2 in the paper

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Distribution of the dijet invariant mass in the signal region, shown together with the parameterized background model (labelled "Bkg Model")....

• #### Figure 3a Cross section limit for m(N1,N2)=(10,65)GeV

Figure 3a in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 3b Cross section limit for m(N1,N2)=(10,80)GeV

Figure 3b in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 3c Cross section limit for m(N1,N2)=(10,95)GeV

Figure 3c in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 3d Cross section limit for m(N1,N2)=(10,110)GeV

Figure 3d in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 3e Cross section limit for m(N1,N2)=(20,80)GeV

Figure 3e in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 3f Cross section limit for m(N1,N2)=(30,80)GeV

Figure 3f in the paper

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Upper limits at 95% CL on the $pp \rightarrow ZH$ cross section times the branching ratio for $Z \rightarrow \ell^{+}\ell^{-}$...

• #### Figure 5a Branching ratio limit for m(N1,N2)=(10,65)GeV

Figure 5a in the auxiliary material

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Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Figure 5b Branching ratio limit for m(N1,N2)=(10,80)GeV

Figure 5b in the auxiliary material

10.17182/hepdata.104855.v1/t13

Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Figure 5c Branching ratio limit for m(N1,N2)=(10,95)GeV

Figure 5c in the auxiliary material

10.17182/hepdata.104855.v1/t14

Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Figure 5d Branching ratio limit for m(N1,N2)=(10,110)GeV

Figure 5d in the auxiliary material

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Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Figure 5e Branching ratio limit for m(N1,N2)=(20,80)GeV

Figure 5e in the auxiliary material

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Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Figure 5f Branching ratio limit for m(N1,N2)=(30,80)GeV

Figure 5f in the auxiliary material

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Upper limits at 95% CL on the branching ratio $H \rightarrow \tilde{\chi}_{2}^{0}\tilde{\chi}_{1}^{0} \rightarrow a \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0} \rightarrow b\bar{b} \tilde{\chi}_{1}^{0}\tilde{\chi}_{1}^{0}$ as a...

• #### Table 3 Cut flow for the signal sample m(a,N1,N2)=(45,10,80)GeV

Table 3 in the auxiliary material

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Unweighted and weighted number of events after each stage of selection for the NMSSM scenario with $pp \rightarrow ZH$, \$Z...

• #### Table 4 Acceptance and efficiency of this analysis.

Table 4 in the auxiliary material

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Acceptance and efficiency of this analysis for the signal models considered in this paper. The signal is an NMSSM scenario...

• #### Table 5 Acceptance and efficiency of this analysis.

Table 5 in the auxiliary material

10.17182/hepdata.104855.v1/t20

Acceptance and efficiency of this analysis for the signal models considered in this paper. The signal is an NMSSM scenario...