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Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC

  • Author(s): Aad, G
  • Abajyan, T
  • Abbott, B
  • Abdallah, J
  • Abdel Khalek, S
  • Abdelalim, AA
  • Abdinov, O
  • Aben, R
  • Abi, B
  • Abolins, M
  • Abouzeid, OS
  • Abramowicz, H
  • Abreu, H
  • Acharya, BS
  • Adamczyk, L
  • Adams, DL
  • Addy, TN
  • Adelman, J
  • Adomeit, S
  • Adragna, P
  • Adye, T
  • Aefsky, S
  • Aguilar-Saavedra, JA
  • Agustoni, M
  • Aharrouche, M
  • Ahlen, SP
  • Ahles, F
  • Ahmad, A
  • Ahsan, M
  • Aielli, G
  • Akdogan, T
  • Åkesson, TPA
  • Akimoto, G
  • Akimov, AV
  • Alam, MS
  • Alam, MA
  • Albert, J
  • Albrand, S
  • Aleksa, M
  • Aleksandrov, IN
  • Alessandria, F
  • Alexa, C
  • Alexander, G
  • Alexandre, G
  • Alexopoulos, T
  • Alhroob, M
  • Aliev, M
  • Alimonti, G
  • Alison, J
  • Allbrooke, BMM
  • Allport, PP
  • Allwood-Spiers, SE
  • Almond, J
  • Aloisio, A
  • Alon, R
  • Alonso, A
  • Alonso, F
  • Altheimer, A
  • Alvarez Gonzalez, B
  • Alviggi, MG
  • Amako, K
  • Amelung, C
  • Ammosov, VV
  • Amor Dos Santos, SP
  • Amorim, A
  • Amram, N
  • Anastopoulos, C
  • Ancu, LS
  • Andari, N
  • Andeen, T
  • Anders, CF
  • Anders, G
  • Anderson, KJ
  • Andreazza, A
  • Andrei, V
  • Andrieux, ML
  • Anduaga, XS
  • Anger, P
  • Angerami, A
  • Anghinolfi, F
  • Anisenkov, A
  • Anjos, N
  • Annovi, A
  • Antonaki, A
  • Antonelli, M
  • Antonov, A
  • Antos, J
  • Anulli, F
  • Aoki, M
  • Aoun, S
  • Aperio Bella, L
  • Apolle, R
  • et al.
Abstract

© CERN. The results of a search for direct pair production of heavy top-quark partners in 4.7 fb–1 of integrated luminosity from pp collisions at √s = 7 TeV collected by the ATLAS detector at the LHC are reported. Heavy top-quark partners decaying into a top quark and a neutral non-interacting particle are searched for in events with two leptons in the final state. No excess above the Standard Model expectation is observed. Limits are placed on the mass of a supersymmetric scalar top and of a spin-1/2 top-quark partner. A spin-1/2 top-quark partner with a mass between 300 GeV and 480 GeV, decaying to a top quark and a neutral non-interacting particle lighter than 100 GeV, is excluded at 95% confidence level.

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