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@ARTICLE{Aad:588155,
      author       = {Aad, G. and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{S}earch for a new scalar resonance in flavour-changing
                      neutral-current top-quark decays $t \rightarrow q{X}$
                      ($q=u,c$), with ${X} \rightarrow b\bar{b}$, in proton-proton
                      collisions at $\sqrt{s}=13$ {T}e{V} with the {ATLAS}
                      detector},
      reportid     = {PUBDB-2023-04771, arXiv:2301.03902. CERN-EP-2022-176},
      year         = {2023},
      note         = {31 pages in total, 9 figures, 5 tables, submitted to JHEP.
                      All figures including auxiliary figures are available at
                      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2020-16/},
      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\overline{b} $, and the other top quark decays according
                      to the Standard Model, with the W boson decaying
                      leptonically. The final state is thus characterised by an
                      isolated electron or muon and at least four jets. Events are
                      categorised according to the multiplicity of jets and jets
                      tagged as originating from b-quarks, and a neural network is
                      used to discriminate between signal and background
                      processes. The data analysed correspond to 139 fb$^{−1}$
                      of proton–proton collisions at a centre-of-mass energy of
                      13 TeV, 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 $ \mathcal{B}
                      $(t → uX) and between 0.018\% and 0.078\% for the
                      branching fraction $ \mathcal{B} $(t → cX), for masses of
                      the scalar particle X between 20 and 160 GeV.[graphic not
                      available: see fulltext]},
      keywords     = {p p: colliding beams (INSPIRE) / resonance: production
                      (INSPIRE) / top: rare decay (INSPIRE) / neutral current:
                      flavor changing (INSPIRE) / p p: scattering (INSPIRE) / top:
                      pair production (INSPIRE) / bottom: pair production
                      (INSPIRE) / W: leptonic decay (INSPIRE) / jet: multiplicity
                      (INSPIRE) / scalar particle: mass (INSPIRE) / resonance:
                      scalar (INSPIRE) / top: branching ratio: upper limit
                      (INSPIRE) / ATLAS (INSPIRE) / final state: ((n)jet lepton)
                      (INSPIRE) / jet: bottom (INSPIRE) / bottom: particle
                      identification (INSPIRE) / muon (INSPIRE) / electron
                      (INSPIRE) / CERN LHC Coll (INSPIRE) / charm (INSPIRE) / up
                      (INSPIRE) / background (INSPIRE) / bottom anti-bottom
                      (INSPIRE) / neural network (INSPIRE) / data analysis method
                      (INSPIRE) / experimental results (INSPIRE) / 13000 GeV-cms
                      (INSPIRE) / Hadron-Hadron Scattering (autogen)},
      cin          = {ATLAS},
      ddc          = {530},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2301.03902},
      howpublished = {arXiv:2301.03902},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2301.03902;\%\%$},
      doi          = {10.3204/PUBDB-2023-04771},
      url          = {https://bib-pubdb1.desy.de/record/588155},
}