Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in pp Collisions at s= 13 TeV with the ATLAS Detector
Published in Physics Review Letters, 2024
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 . 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 of proton-proton collision data at 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.
Recommended citation: ATLAS Collab. (2024). “Paper Title Number 1.” Physics Review Letter 1. 132(2401.14046).
Recommended citation: APS Physics Review Letters Vol.132 2401.14046
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