@Article{ATLASCollaborationAad_etal2023,
author="ATLAS Collaboration (Aad, G. et al
and Amos, K. R.
and Aparisi Pozo, J. A.
and Bailey, A. J.
and Cabrera Urban, S.
and Cantero, J.
and Cardillo, F.
and Castillo Gimenez, V.
and Costa, M. J.
and Didenko
and Escobar, C.
and Fiorini, L.
and Fullana Torregrosa, E.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gomez Delegido, A. J.
and Gonzalez de la Hoz, S.
and Gonzalvo Rodriguez, G. R.
and Guerrero Rojas, J. G. R.
and Higon-Rodriguez, E.
and Lacasta, C.
and Lozano Bahilo, J. J.
and Marti-Garcia, S.
and Martinez Agullo, P.
and Miralles Lopez, M.
and Mitsou, V. A.
and Monsonis Romero, L.
and Moreno Llacer, M.
and Munoz Perez, D.
and Navarro-Gonzalez, J.
and Poveda, J.
and Prades Iba{\~{n}}ez, A.
and Rubio Jimenez, A.
and Ruiz-Martinez, A.
and Sabatini, P.
and Salt, J.
and Sanchez Sebastian, V.
and Sayago Galvan, I.
and Senthilkumar, V.
and Soldevila, U.
and Sanchez, J.
and Torro Pastor, E.
and Valero, A.
and Valls Ferrer, J. A.
and Varriale, L.
and Villaplana Perez, M.
and Vos, M.",
title="Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t {\textrightarrow} qX (q = u, c), with X {\textrightarrow} b(b)over-bar, in proton-proton collisions at {\textsurd}s=13 TeV with the ATLAS detector",
journal="Journal of High Energy Physics",
year="2023",
publisher="Springer",
volume="07",
number="7",
pages="199--51pp",
optkeywords="Hadron-Hadron Scattering",
abstract="A search for flavour-changing neutral-current decays of a top quark into an up-type quark (either up or charm) and a light scalar particle X decaying into a bottom anti-bottom quark pair is presented. The search focuses on top-quark pair production where one top quark decays to qX, with X -> b (b) over bar, and the other top quark decays according to the Standard Model, with the W boson decaying leptonically. The final state is thus characterised by an isolated electron or muon and at least four jets. Events are categorised according to the multiplicity of jets and jets tagged as originating from b-quarks, and a neural network is used to discriminate between signal and background processes. The data analysed correspond to 139 fb(-1) of proton-proton collisions at a centre-of-mass energy of 13TeV, recorded with the ATLAS detector at the LHC. The 95{\%} confidence-level upper limits between 0.019{\%} and 0.062{\%} are derived for the branching fraction B(t -> uX) and between 0.018{\%} and 0.078{\%} for the branching fraction B(t -> cX), for masses of the scalar particle X between 20 and 160 GeV.",
optnote="WOS:001061847500001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5726), last updated on Wed, 01 Nov 2023 16:41:51 +0000",
issn="1029-8479",
doi="10.1007/JHEP07(2023)199",
opturl="https://arxiv.org/abs/2301.03902",
opturl="https://doi.org/10.1007/JHEP07(2023)199",
language="English"
}