Aad, G.Abbott, B.Abdallah, J.Abdinov, O.Aben, R.Abolins, M.AbouZeid, O. S.Izen, Joseph M.Leyton, MichaelMeirose, BernhardNamasivayam, HarisankarReeves, KendallATLAS Collaboration2016-07-202016-07-202016-01-082016-01-081434-6044http://hdl.handle.net/10735.1/4945A search for the flavour-changing neutral-current decay t → qZ is presented. Data collected by the ATLAS detector during 2012 from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of √s̅ = 8 TeV, corresponding to an integrated luminosity of 20.3 fb⁻¹, are analysed. Top-quark pair-production events with one top quark decaying through the t → qZ (q=u,c) channel and the other through the dominant Standard Model mode t → bW are considered as signal. Only the decays of the Z boson to charged leptons and leptonic W boson decays are used. No evidence for a signal is found and an observed (expected) upper limit on the t → qZ branching ratio of 7 x 10⁻⁴ (8 x 10⁻⁴) is set at the 95% confidence levelenCC BY 4.0 (Attribution)©2016 CERN, for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/Z bosonsJets (Nuclear physics)W bosonsLeptons (Nuclear physics)Top QuarksTransverse momentumArticleAad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2016. "Search for flavour-changing neutral current top-quark decays to qZ in pp collision data collected with the ATLAS detector at √s̅ = 8 TeV." European Physical Journal C 76(1): 1-24.761