Search for a new scalar resonance in flavour-changing neutral-current top-quark decays $t \rightarrow qX$ ($q=u,c$), with $X \rightarrow b\bar{b}$, in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector - INSPIRE

DataBETA

Search for a new scalar resonance in flavour-changing neutral-current top-quark decays $t \rightarrow qX$ ( $q=u,c$ ), with $X \rightarrow b\bar{b}$ , in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS

Collaboration

Jan 10, 2023

50 pages

Published in:

JHEP 07 (2023) 199

Published: Jul 26, 2023

e-Print:

2301.03902 [hep-ex]

DOI:

10.1007/JHEP07(2023)199

PDG: Other Mass Limits

Report number:

CERN-EP-2022-176

Experiments:

CERN-LHC-ATLAS

View in:

reference search29 citations

Citations per year

Abstract: (Springer)

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]

Note:

50 pages in total, 9 figures, 5 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2020-16/

Hadron-Hadron Scattering
p p: colliding beams
resonance: production
top: rare decay
neutral current: flavor changing
p p: scattering
top: pair production
bottom: pair production
W: leptonic decay
jet: multiplicity

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