0587920 - FZÚ 2025 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abeling, K. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2858 authors
Search for nearly mass-degenerate Higgsinos using low-momentum mildly displaced tracks in 𝑝⁢𝑝 collisions at √𝑠=13  TeV with the ATLAS Detector.
Physical Review Letters. Roč. 132, č. 22 (2024), č. článku 221801. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT(CZ) EH22_008/0004632
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * dark matter: direct detection * CERN LEP Stor * transverse
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Open access

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 √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.
Permanent Link: https://hdl.handle.net/11104/0354989