Search for flavour-changing neutral current top-quark decays to qZ in pp collision data collected with the ATLAS detector at √ s =8 TeV

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (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. European physical journal. C - particles and fields, 76(1) EDP Sciences 10.1140/epjc/s10052-015-3851-5

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A 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 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

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