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 Formula Presented. 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 Formula Presented of proton-proton collision data at Formula Presented 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.

Aad, G., Aakvaag, E., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., et al. (2024). Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in pp Collisions at √s=13 TeV with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 132(22) [10.1103/PhysRevLett.132.221801].

Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in pp Collisions at √s=13 TeV with the ATLAS Detector

Cerri A.;
2024-01-01

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 Formula Presented. 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 Formula Presented of proton-proton collision data at Formula Presented 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.
2024
Aad, G., Aakvaag, E., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., et al. (2024). Search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced Tracks in pp Collisions at √s=13 TeV with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 132(22) [10.1103/PhysRevLett.132.221801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1317579