Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in <math display="inline"><mi>p</mi><mi>p</mi></math> Collisions at <math display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> with the ATLAS Detector

Aad, Georges; Aakvaag, Erlend; Abbott, Braden Keim; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboelela, Mohammed; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso

doi:10.1103/PhysRevLett.132.221801

Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in $p p$ Collisions at $\sqrt{s} = 13 TeV$ with the ATLAS Detector

ATLAS

Collaboration

Jan 25, 2024

24 pages

Published in:

Phys.Rev.Lett. 132 (2024) 22, 221801

Published: May 30, 2024

e-Print:

2401.14046 [hep-ex]

DOI:

10.1103/PhysRevLett.132.221801 (publication)

Report number:

CERN-EP-2024-012

Experiments:

CERN-LHC-ATLAS

View in:

datasets

reference search19 citations

Citations per year

Abstract: (APS)

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 to 0.9 GeV is excluded at 95% confidence level, with a maximum reach of approximately 170 GeV in the Higgsino mass.

Note:

37 pages in total, author list starting page 20, 5+1aux figures, 1+2aux tables, submitted to Physical Review Letters. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2020-04

p p: scattering
p p: colliding beams
transverse momentum: missing-energy
scale: electroweak interaction
tracks
mass difference
ATLAS
dark matter: direct detection
CERN LEP Stor
transverse

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