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- W4315706514 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 $X rightarrow bbar{b}$, 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 $mathcal{B}$($t rightarrow uX$) and between 0.018% and 0.078% for the branching fraction $mathcal{B}$($t rightarrow cX$), for masses of the scalar particle $X$ between 20 and 160 GeV." @default.
- W4315706514 created "2023-01-12" @default.
- W4315706514 creator A5086903549 @default.
- W4315706514 date "2023-01-10" @default.
- W4315706514 modified "2023-09-26" @default.
- W4315706514 title "Search for a new scalar resonance in flavour-changing neutral-current top-quark decays $t rightarrow qX$ ($q=u,c$), with $X rightarrow bbar{b}$, in proton-proton collisions at $sqrt{s}=13$ TeV with the ATLAS detector" @default.
- W4315706514 doi "https://doi.org/10.48550/arxiv.2301.03902" @default.
- W4315706514 hasPublicationYear "2023" @default.
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