Search for long-lived charginos based on a disappearing-track signature using 136 fb <sup>- 1</sup> of pp collisions at √s = 13 TeV with the ATLAS detector
Creators: name: Aad, G
name: Abbott, B
name: Abbott, DC
name: Abed Abud, A
name: Abeling, K
name: Abhayasinghe, DK
name: Abidi, SH
name: Abramowicz, H
name: Abreu, H
name: Abulaiti, Y
name: Abusleme Hoffman, AC
name: Acharya, BS
name: Achkar, B
name: Adam, L
name: Adam Bourdarios, C
name: Adamczyk, L
name: Adamek, L
name: Adelman, J
name: Adiguzel, A
name: Adorni, S
name: Adye, T
name: Affolder, AA
name: Afik, Y
name: Agapopoulou, C
name: Agaras, MN
name: Agarwala, J
name: Aggarwal, A
name: Agheorghiesei, C
name: Aguilar-Saavedra, JA
name: Ahmad, A
name: Ahmadov, F
name: Ahmed, WS
name: Ai, X
name: Aielli, G
name: Akatsuka, S
name: Akbiyik, M
name: Åkesson, TPA
name: Akimov, AV
name: Al Khoury, K
name: Alberghi, GL
name: Albert, J
name: Alconada Verzini, MJ
name: Alderweireldt, S
name: Aleksa, M
name: Aleksandrov, IN
name: Alexa, C
name: Alexopoulos, T
name: Alfonsi, A
name: Alfonsi, F
name: Alhroob, M
name: Ali, B
name: Ali, S
name: Aliev, M
name: Alimonti, G
name: Allaire, C
name: Allbrooke, BMM
name: Allport, PP
name: Aloisio, A
name: Alonso, F
name: Alpigiani, C
name: Camelia, EA
name: Alvarez Estevez, M
name: Alviggi, MG
name: Amaral Coutinho, Y
name: Ambler, A
name: Ambroz, L
name: Amelung, C
name: Amidei, D
name: Amor Dos Santos, SP
name: Amoroso, S
name: Amrouche, CS
name: Anastopoulos, C
name: Andari, N
name: Andeen, T
name: Anders, JK
name: Andrean, SY
name: Andreazza, A
name: Andrei, V
name: Angelidakis, S
name: Angerami, A
name: Anisenkov, AV
name: Annovi, A
name: Antel, C
name: Anthony, MT
name: Antipov, E
name: Antonelli, M
name: Antrim, DJA
name: Anulli, F
name: Aoki, M
name: Pozo, JAA
name: Aparo, MA
name: Aperio Bella, L
name: Aranzabal, N
name: Araujo Ferraz, V
name: Arcangeletti, C
name: Arce, ATH
name: Arena, E
name: Arguin, JF
name: Argyropoulos, S
name: Arling, JH
Publisher: name: Apollo - University of Cambridge Repository
Year: 2022
Subjects: Regular Article - Experimental Physics

description: 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 $\sqrt{s}$ = 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.