Search for pair-produced higgsinos decaying via Higgs or $Z$ bosons to final states containing a pair of photons and a pair of $b$-jets with the ATLAS detector

The ATLAS collaboration
CERN-EP-2023-039, 2024.

Abstract (data abstract)
A search is presented for the pair production of higgsinos $\tilde{\chi}$ in gauge-mediated supersymmetry models, where the lightest neutralinos $\tilde{\chi}_1^0$ decay into a light gravitino $\tilde{G}$ either via a Higgs $h$ or $Z$ boson. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb$^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\sqrt{s} =13\,\mathrm{TeV}$. It targets final states in which a Higgs boson decays into a photon pair, while the other Higgs or $Z$ boson decays into a $b\bar{b}$ pair, with missing transverse momentum associated with the two gravitinos. Search regions dependent on the amount of missing transverse momentum are defined by the requirements that the diphoton mass should be consistent with the mass of the Higgs boson, and the $b\bar{b}$ mass with the mass of the Higgs or $Z$ boson. The main backgrounds are estimated with data-driven methods using the sidebands of the diphoton mass distribution. No excesses beyond Standard Model expectations are observed and higgsinos with masses up to $320\,\mathrm{GeV}$ are excluded, assuming a branching fraction of 100% for $\tilde{\chi}_1^0\rightarrow h\tilde{G}$. This analysis excludes higgsinos with masses of $130\,\mathrm{GeV}$ for branching fractions to $h\tilde{G}$ as low as 36%, thus providing complementarity to previous ATLAS searches in final states with multiple leptons or multiple $b$-jets, targeting different decays of the electroweak bosons.

  • Table of Contents

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    - - - - - - - - Overview of HEPData Record - - - - - - - -...

  • Distribution 1

    Data from Figure 3a

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    Distribution of the diphoton invariant mass in validation region VR1. The solid histograms are stacked to show the SM expectations...

  • Distribution 2

    Data from Figure 3b

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    Distribution of the missing transverse momentum in validation region VR1. The solid histograms are stacked to show the SM expectations...

  • Distribution 3

    Data from Figure 3c

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    Distribution of the diphoton invariant mass in validation region VR2. The solid histograms are stacked to show the SM expectations...

  • Distribution 4

    Data from Figure 3d

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    Distribution of the missing transverse momentum in validation region VR2. The solid histograms are stacked to show the SM expectations...

  • Distribution 5

    Data from Figure 4a

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    Distribution of the diphoton invariant mass with all selections of the signal regions applied, except on mγγ itself, for signal...

  • Distribution 6

    Data from Figure 4b

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    Distribution of the diphoton invariant mass with all selections of the signal regions applied, except on mγγ itself, for signal...

  • Distribution 7

    Data from Figure 4c

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    Distribution of the diphoton invariant mass with all selections of the signal regions applied, except on mγγ itself, for signal...

  • X-section U.L. 1

    Data from Figure 5

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    Observed and expected limits on the pure higgsino cross-section at 95% CL assuming B(χ̃01 → hG̃ )=100% for different χ̃01...

  • Exclusion contour 1

    Data from Figure 6

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    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Exclusion contour 2

    Data from Figure 6

    10.17182/hepdata.144072.v1/t11

    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Exclusion contour 3

    Data from Figure 6

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    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Exclusion contour 4

    Data from Figure 6

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    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Exclusion contour 5

    Data from Figure 6

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    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Exclusion contour 6

    Data from Figure 6

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    Observed and expected 95% CL limits on the pure-higgsino branching fraction to B(χ̃01 → hG̃ ) as a function of...

  • Distribution 8

    Data from Auxiliary Figure 1

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    Numbers of signal and background events in the signal regions. The respective background estimation techniques are applied. The background category...

  • X-section U.L. 2

    Data from Auxiliary Figure 3

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    Observed 95% CL limits in pb on the pure higgsino cross-section, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Limits...

  • Acceptance 1

    Data from Auxiliary Figure 4a

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    Acceptances for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Acceptances are...

  • Acceptance 2

    Data from Auxiliary Figure 4b

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    Acceptances for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Acceptances are...

  • Acceptance 3

    Data from Auxiliary Figure 4c

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    Acceptances for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Acceptances are...

  • Efficiency 1

    Data from Auxiliary Figure 5a

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    Efficiencies for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Efficiencies are...

  • Efficiency 2

    Data from Auxiliary Figure 5b

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    Efficiencies for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Efficiencies are...

  • Efficiency 3

    Data from Auxiliary Figure 5c

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    Efficiencies for all signal model points considered in the analysis, shown in the m(χ̃01)-B(χ̃01 → hG̃ ) plane. Efficiencies are...

  • Yields Table 1

    Data from Table 3

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    Observed and expected numbers of events in the three signal regions. The background category "h (other)" includes events originating from...

  • Cutflow 1

    Data from Auxiliary Table 1

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    Cutflows of two benchmark signal points assuming B(χ̃01 → hG̃ )=100% for all three discovery signal regions. The initial selection...

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