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

The ATLAS collaboration
CERN-EP-2021-098, 2021.

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

    10.17182/hepdata.104855.v1/t1

    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

    10.17182/hepdata.104855.v1/t2

    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

    10.17182/hepdata.104855.v1/t3

    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

    10.17182/hepdata.104855.v1/t4

    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

    10.17182/hepdata.104855.v1/t5

    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

    10.17182/hepdata.104855.v1/t6

    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

    10.17182/hepdata.104855.v1/t7

    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

    10.17182/hepdata.104855.v1/t8

    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

    10.17182/hepdata.104855.v1/t9

    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

    10.17182/hepdata.104855.v1/t10

    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

    10.17182/hepdata.104855.v1/t11

    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

    10.17182/hepdata.104855.v1/t12

    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

    10.17182/hepdata.104855.v1/t15

    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

    10.17182/hepdata.104855.v1/t16

    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

    10.17182/hepdata.104855.v1/t17

    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

    10.17182/hepdata.104855.v1/t18

    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

    10.17182/hepdata.104855.v1/t19

    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...

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