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Addison, M J; Alfonsi, F; Allbrooke, B M M; Aly, M; Angerami, A; Anulli, F; Badea, A; Balz, J; Bhattacharya, D S; Bogdanchikov, A G; Bohm, C; Bruschi, M; Carnelli, A; Catmore, J R; Chen, Y; Cindro, V; Coccaro, A; Cowan, G; Damp, J; Demichev, M; Desch, K; Dias, F A; Dimitriadi, C; Draguet, M A; Earnshaw, Z O; Ellinghaus, F; Errenst, M; Evans, L S; Ferguson, R A M; mica, A; ti, A C; Gallop, B J; Gan, K K; Giugliarelli, G; Guhit, J A M; Han, J; Hasegawa, Y; Hawkes, C M; Hellman, S; Huebner, M; Jinnouchi, O; Juste Rozas, A; Kalaitzidou, I; Kang, N J; Keeler, R; Kremer, J A; Kuesters, R; Kurova, A; Liberatore, M; Lohse, T; Loiacono, E; Lu, S; Luehring, F; Ma, H; Mac Donell, D M; Mali, M; Mallik, U; Mckenzie, R P; Min, T; Morinaga, M; Nicolaidou, R; Niemeyer, M; Palacino, G; Park, K R; Pettersson, N E; Prokofiev, K; Puddefoot, J E; Ramakoti, E; Rebuzzi, D M; Rej, A; Reynolds, E; Richter-Was, E; Riedler, P; Sandoval, C; Schwienhorst, R; Shahinian, J D; Sheppard, D J; Shipsey, I P J; Shojaii, J; Simion, S; Singh, S; Stavropoulos, G; Tafoya Vargas, J S; Tanasini, M; Tikhonov, Yu A; Ting, E X L; Torró Pastor, E; Tost, M; Vachon, B; Varouchas, D; Wada, S; Wang, X; Warrack, N; Williams, H H; Wu, Z; Xin, S; Yacoob, S; Yan, S; Yang, H J; Zhou, N
Physical review letters, 05/2024, Letnik: 132, Številka: 22Journal Article
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 sqrts=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.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 sqrts=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.
