Clark, Brian LeeFranklin, MelissaHuth, JohnIppolito, ValerioLazovich, TomoLopez Mateos, DavidMercurio, KevinMorii, MasahiroSpearman, WilliamSun, SiyuanTolley, EmmaTuna, AlexanderYen, AndyZambito, Stefano2017-07-202016ATLAS Collaboration. 2016. “Search for flavour-changing neutral current top-quark decays to qZ in pp collision data collected with the ATLAS detector at s√=8 TeV.” The European Physical Journal C 76 (1) (January). doi:10.1140/epjc/s10052-015-3851-5.1434-6044http://nrs.harvard.edu/urn-3:HUL.InstRepos:33470145A 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 s√=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 7×10−4 (8×10−4) is set at the 95% confidence level.en-USJournal Article2017-07-2010.1140/epjc/s10052-015-3851-5