Search for long-lived charginos based on a disappearing-track signature using 136 fb⁻¹ of pp collisions at √s = 13 TeV with the ATLAS detector

Anders, J. K.; Beck, H. P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L.; Haug, S.; Ilg, A.; Lehmann, N.; Weber, M. S. (2022). Search for long-lived charginos based on a disappearing-track signature using 136 fb⁻¹ of pp collisions at √s = 13 TeV with the ATLAS detector. The European physical journal. C, Particles and fields, 82(7), p. 606. Springer 10.1140/epjc/s10052-022-10489-5

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A search for long-lived charginos produced either directly or in the cascade decay of heavy prompt gluino states is presented. The search is based on proton–proton collision data collected at a centre-of-mass energy of s√ = 13 TeV between 2015 and 2018 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 136 fb−1. Long-lived charginos are characterised by a distinct signature of a short and then disappearing track, and are reconstructed using at least four measurements in the ATLAS pixel detector, with no subsequent measurements in the silicon-microstrip tracking volume nor any associated energy deposits in the calorimeter. The final state is complemented by a large missing transverse-momentum requirement for triggering purposes and at least one high-transverse-momentum jet. No excess above the expected backgrounds is observed. Exclusion limits are set at 95% confidence level on the masses of the chargino and gluino for different chargino lifetimes. Chargino masses up to 660 (210) GeV are excluded in scenarios where the chargino is a pure wino (higgsino). For charginos produced during the cascade decay of a heavy gluino, gluinos with masses below 2.1 TeV are excluded for a chargino mass of 300 GeV and a lifetime of 0.2 ns.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Anders, John Kenneth, Beck, Hans Peter, Chatterjee, Meghranjana, Ereditato, Antonio, Franconi, Laura, Halser, Lea, Haug, Sigve, Ilg, Armin, Lehmann, Niklaus, Weber, Michele


500 Science > 530 Physics









Date Deposited:

13 Apr 2023 16:14

Last Modified:

13 Apr 2023 16:14

Publisher DOI:


Additional Information:

Kollaboration - Es sind nur die Berner Autor*innen namentlich erwaehnt; ATLAS collaboration




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