@Article{ATLASCollaborationAaboud_etal2018,
author="ATLAS Collaboration (Aaboud, M. et al
and Alvarez Piqueras, D.
and Barranco Navarro, L.
and Cabrera Urban, S.
and Castillo Gimenez, V.
and Cerda Alberich, L.
and Costa, M. J.
and Escobar, C.
and Estrada Pastor, O.
and Fernandez Martinez, P.
and Ferrer, A.
and Fiorini, L.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gonzalez de la Hoz, S.
and Higon-Rodriguez, E.
and Jimenez Pena, J.
and Lacasta, C.
and Madaffari, D.
and Mamuzic, J.
and Marti-Garcia, S.
and Melini, D.
and Mitsou, V. A.
and Pedraza Lopez, S.
and Rodriguez Bosca, S.
and Rodriguez Rodriguez, D.
and Romero Adam, E.
and Salt, J.
and Soldevila, U.
and Sanchez, J.
and Valero, A.
and Valls Ferrer, J. A.
and Vos, M.",
title="Search for flavour-changing neutral current top-quark decays t -> qZ in proton-proton collisions at root s=13 TeV with the ATLAS detector",
journal="Journal of High Energy Physics",
year="2018",
publisher="Springer",
volume="07",
number="7",
pages="176--41pp",
optkeywords="Hadron-Hadron scattering (experiments)",
abstract="A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of root s = 13TeV, corresponding to an integrated luminosity of 36.1 fb(-1), are analysed. The search is performed using top-quark pair events, with one top quark decaying through the t -> qZ (q = u, c) flavour-changing neutral-current channel, and the other through the dominant Standard Model mode t -> bW. Only Z boson decays into charged leptons and leptonic W boson decays are considered as signal. Consequently, the final-state topology is characterized by the presence of three isolated charged leptons (electrons or muons), at least two jets, one of the jets originating from a b-quark, and missing transverse momentum from the undetected neutrino. The data are consistent with Standard Model background contributions, and at 95{\%} confidence level the search sets observed (expected) upper limits of 1.7 x 10(-4) (2.4 x 10(-4)) on the t -> uZ branching ratio and 2.4 x 10(-4) (3.2 x 10(-4)) on the t -> cZ branching ratio, constituting the most stringent limits to date.",
optnote="WOS:000443814800001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3727), last updated on Sat, 22 Sep 2018 11:58:50 +0000",
issn="1029-8479",
doi="10.1007/JHEP07(2018)176",
opturl="http://arxiv.org/abs/1803.09923",
opturl="https://doi.org/10.1007/JHEP07(2018)176",
archivePrefix="arXiv",
eprint="1803.09923",
language="English"
}