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

ATLAS Publications, S. Alderweireldt, T.M. Carter, A. Hasib, M.P. Heath, S. Palazzo, E.P. Takeva, N. Themistokleous, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Article number606
Pages (from-to)1-34
Number of pages34
JournalThe European Physical Journal C
Volume82
Issue number7
DOIs
Publication statusPublished - 11 Jul 2022

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