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Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t †-> qX (q = u, c), with X ->†’ b(b)over-bar, in proton-proton collisions at root ˆšs=13 TeV with the ATLAS detector
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- Aad, G. (author)
- Univ Calif Berkeley, Berkeley, CA USA.;Univ Bucharest, Fac Phys, Bucharest, Romania.;IThemba Labs, Western Cape, South Africa.;Univ Cadi Ayyad, Fac Sci Semlalia, LPHEA, Marrakech, Morocco.;New York Univ Abu Dhabi, Abu Dhabi, U Arab Emirates.;Univ Georgia, Tbilisi, Georgia.
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- Bergeås Kuutmann, Elin, 1980- (author)
- Uppsala universitet,Högenergifysik
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- Brenner, Richard (author)
- Uppsala universitet,Högenergifysik
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- Univ Calif Berkeley, Berkeley, CA USA;Univ Bucharest, Fac Phys, Bucharest, Romania.;IThemba Labs, Western Cape, South Africa.;Univ Cadi Ayyad, Fac Sci Semlalia, LPHEA, Marrakech, Morocco.;New York Univ Abu Dhabi, Abu Dhabi, U Arab Emirates.;Univ Georgia, Tbilisi, Georgia. Högenergifysik (creator_code:org_t)
- Springer, 2023
- 2023
- English.
- In: Journal of High Energy Physics (JHEP). - : Springer. - 1126-6708 .- 1029-8479.
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Keyword
- Hadron-Hadron Scattering
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- ref (subject category)
- art (subject category)
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