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Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in $pp$ Collisions at $\sqrt{s}$ = 13 TeV with the ATLAS Detector
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abstract
Higgsinos with masses near the electroweak scale can solve the hierarchy problem and provide a dark matter candidate, while detecting them at the LHC remains challenging if their mass splitting is $\mathcal{O}(1 \text{GeV})$. This Letter presents a novel search for nearly mass-degenerate Higgsinos in events with an energetic jet, missing transverse momentum, and a low-momentum track with a significant transverse impact parameter using 140 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected by the ATLAS experiment. For the first time since LEP, a range of mass splittings between the lightest charged and neutral Higgsinos from $0.3$ GeV to $0.9$ GeV is excluded at 95$\%$ confidence level, with a maximum reach of approximately $170$ GeV in the Higgsino mass.
Forward citations
Cited by 2 Pith papers
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Search for higgsinos in compressed mass spectra using low-momentum tracks in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess over the Standard Model is observed; ATLAS excludes chargino masses below 126 GeV at 95% CL for mass splittings of 0.3–2 GeV in a simplified higgsino model.
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The curtain lowers on directly detectable higgsino dark matter
Using LZ2024 limits, the paper derives new lower bounds on gaugino masses and upper bounds on higgsino mass splittings in decoupled-MSSM higgsino dark matter scenarios, plus projections for the neutrino fog.
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