Abstract (data 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

O

(1 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.

SR Yields Table

Table 1 from main body

10.17182/hepdata.146944.v2/t1

Number of expected and observed data events in the SR (top), and the model-independent upper limits obtained from their consistency...
Expected exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t2

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Expected $+ 1 σ$ exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t3

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Expected $- 1 σ$ exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t4

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Observed exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t5

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Observed $+ 1 σ$ exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t6

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Observed $- 1 σ$ exclusion limits from Figure 3

Figure 3 from main body

10.17182/hepdata.146944.v2/t7

Expected (dashed black line) and observed (solid red line) 95% CL exclusion limits on the higgsino simplified model being considered....
Expected CLs values from Figure 3a

Figure 3a from auxiliary material

10.17182/hepdata.146944.v2/t8

Expected and observed CLs values per signal point represented by the grey numbers. The expected (dashed) and observed (solid) 95%...
Observed CLs values from Figure 3b

Figure 3b from auxiliary material

10.17182/hepdata.146944.v2/t9

Expected and observed CLs values per signal point represented by the grey numbers. The expected (dashed) and observed (solid) 95%...
Expected cross-section upper-limits from Figure 4a

Figure 4a from auxiliary material

10.17182/hepdata.146944.v2/t10

Expected and observed cross-section upper-limit per signal point represented by the grey numbers. The expected (dashed) and observed (solid) 95%...
Observed cross-section upper-limits from Figure 4b

Figure 4b from auxiliary material

10.17182/hepdata.146944.v2/t11

Expected and observed cross-section upper-limit per signal point represented by the grey numbers. The expected (dashed) and observed (solid) 95%...
Signal acceptances for ${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$

Figure 5a from auxiliary material

10.17182/hepdata.146944.v2/t12

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$

Figure 5b from auxiliary material

10.17182/hepdata.146944.v2/t13

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
Signal acceptances for ${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$

Figure 5c from auxiliary material

10.17182/hepdata.146944.v2/t14

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$

Figure 5d from auxiliary material

10.17182/hepdata.146944.v2/t15

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$

Figure 5e from auxiliary material

10.17182/hepdata.146944.v2/t16

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
Signal acceptances for ${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{1}^{2}$

Figure 5f from auxiliary material

10.17182/hepdata.146944.v2/t17

Truth-level signal acceptances for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ) in a SR with...
${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$ SR-Low signal efficiencies

Figure 6a from auxiliary material

10.17182/hepdata.146944.v2/t18

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$ SR-Low signal efficiencies

Figure 6b from auxiliary material

10.17182/hepdata.146944.v2/t19

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

Figure 6c from auxiliary material

10.17182/hepdata.146944.v2/t20

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

Figure 6d from auxiliary material

10.17182/hepdata.146944.v2/t21

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ SR-Low signal efficiencies

Figure 6e from auxiliary material

10.17182/hepdata.146944.v2/t22

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

Figure 6f from auxiliary material

10.17182/hepdata.146944.v2/t23

Signal efficiencies in SR-Low for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$ SR-High signal efficiencies

Figure 7a from auxiliary material

10.17182/hepdata.146944.v2/t24

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$ SR-High signal efficiencies

Figure 7b from auxiliary material

10.17182/hepdata.146944.v2/t25

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

Figure 7c from auxiliary material

10.17182/hepdata.146944.v2/t26

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

Figure 7d from auxiliary material

10.17182/hepdata.146944.v2/t27

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ SR-High signal efficiencies

Figure 7e from auxiliary material

10.17182/hepdata.146944.v2/t28

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

Figure 7f from auxiliary material

10.17182/hepdata.146944.v2/t29

Signal efficiencies in SR-High for each production process ( ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{1}^{0}$ , ${\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}$ , ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ , and ${\tilde{χ}}_{2}^{0} {\tilde{χ}}_{1}^{0}$ ), defined by the...
Cutflows Table 1

Table 1 from auxiliary material

10.17182/hepdata.146944.v2/t30

Event selection cutflows for signal samples with $m ({\tilde{χ}}_{1}^{0})$ = 150 GeV and $Δ m ({\tilde{χ}}_{1}^{\pm}, {\tilde{χ}}_{1}^{0})$ = 1.5, 1.0, and 0.75...
Cutflows Table 2

Table 2 from auxiliary material

10.17182/hepdata.146944.v2/t31

Event selection cutflows for signal samples with $m ({\tilde{χ}}_{1}^{0})$ = 150 GeV and $Δ m ({\tilde{χ}}_{1}^{\pm}, {\tilde{χ}}_{1}^{0})$ = 0.5, 0.35, and 0.25...

SR Yields Table

Expected exclusion limits from Figure 3

Expected $+ 1 σ$ exclusion limits from Figure 3

Expected $- 1 σ$ exclusion limits from Figure 3

Observed exclusion limits from Figure 3

Observed $+ 1 σ$ exclusion limits from Figure 3

Observed $- 1 σ$ exclusion limits from Figure 3

Expected CLs values from Figure 3a

Observed CLs values from Figure 3b

Expected cross-section upper-limits from Figure 4a

Observed cross-section upper-limits from Figure 4b

Signal acceptances for ${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$

Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$

Signal acceptances for ${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$

Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$

Signal acceptances for ${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$

Signal acceptances for ${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{1}^{2}$

${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{2}^{0}$ SR-Low signal efficiencies

${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{1}^{0}$ SR-High signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{0}$ SR-High signal efficiencies

${\tilde{χ}}_{1}^{-} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

${\tilde{χ}}_{1}^{+} {\tilde{χ}}_{1}^{-}$ SR-High signal efficiencies

${\tilde{χ}}_{1}^{0} {\tilde{χ}}_{2}^{0}$ SR-High signal efficiencies

Cutflows Table 1

Cutflows Table 2

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SR Yields Table

Expected exclusion limits from Figure 3

Expected +1σ exclusion limits from Figure 3

Expected −1σ exclusion limits from Figure 3

Observed exclusion limits from Figure 3

Observed +1σ exclusion limits from Figure 3

Observed −1σ exclusion limits from Figure 3

Expected CLs values from Figure 3a

Observed CLs values from Figure 3b

Expected cross-section upper-limits from Figure 4a

Observed cross-section upper-limits from Figure 4b

Signal acceptances for χ~1−χ~10

Signal acceptances for χ~1+χ~10

Signal acceptances for χ~1−χ~20

Signal acceptances for χ~1+χ~20

Signal acceptances for χ~1+χ~1−

Signal acceptances for χ~10χ~12

χ~1−χ~10 SR-Low signal efficiencies

χ~1+χ~10 SR-Low signal efficiencies

χ~1−χ~20 SR-Low signal efficiencies

χ~1+χ~20 SR-Low signal efficiencies

χ~1+χ~1− SR-Low signal efficiencies

χ~10χ~20 SR-Low signal efficiencies

χ~1−χ~10 SR-High signal efficiencies

χ~1+χ~10 SR-High signal efficiencies

χ~1−χ~20 SR-High signal efficiencies

χ~1+χ~20 SR-High signal efficiencies

χ~1+χ~1− SR-High signal efficiencies

χ~10χ~20 SR-High signal efficiencies