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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.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t1","@type":"Dataset","description":"Number of expected and observed data events in the SR (top), and the model-independent upper limits obtained from their consistency...","name":"SR Yields Table"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t2","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Expected exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t3","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Expected $+1\\sigma$ exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t4","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Expected $-1\\sigma$ exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t5","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Observed exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t6","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Observed $+1\\sigma$ exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t7","@type":"Dataset","description":"Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....","name":"Observed $-1\\sigma$ exclusion limits from Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t8","@type":"Dataset","description":"Expected and observed CLs values per signal point represented by the grey numbers. 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The expected (dashed) and observed (solid) 95%...","name":"Observed cross-section upper-limits from Figure 4b"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t12","@type":"Dataset","description":"Truth-level signal acceptances for each production process ($\\tilde{\\chi}_1^\\pm \\tilde{\\chi}_1^0$, $\\tilde{\\chi}_1^\\pm \\tilde{\\chi}_2^0$, $\\tilde{\\chi}_1^+ \\tilde{\\chi}_1^-$, and $\\tilde{\\chi}_2^0 \\tilde{\\chi}_1^0$) in a SR with...","name":"Signal acceptances for $\\tilde{\\chi}_1^- \\tilde{\\chi}_1^0$"},{"@id":"https://doi.org/10.17182/hepdata.146944.v2/t13","@type":"Dataset","description":"Truth-level signal acceptances for each production process ($\\tilde{\\chi}_1^\\pm \\tilde{\\chi}_1^0$, $\\tilde{\\chi}_1^\\pm \\tilde{\\chi}_2^0$, $\\tilde{\\chi}_1^+ \\tilde{\\chi}_1^-$, and $\\tilde{\\chi}_2^0 \\tilde{\\chi}_1^0$) in a SR with...","name":"Signal acceptances for $\\tilde{\\chi}_1^+ 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