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 Aad, G. Aguilar Saavedra, Juan Antonio Rodríguez Chala, Mikael Atlas Collaboration 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-transversemomentum 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)GeVare 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. 2022-09-05T09:44:58Z 2022-09-05T09:44:58Z 2022-07-11 journal article Aad, G... [et al.]. 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. Eur. Phys. J. C 82, 606 (2022). [https://doi.org/10.1140/epjc/s10052-022-10489-5] http://hdl.handle.net/10481/76518 10.1140/epjc/s10052-022-10489-5 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer