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

Physics

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Experimental Particle Physics

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https://doi.org/10.1007/jhep07(2023)199
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Available under license: CC BY: Creative Commons Attribution 4.0 International License

Keywords

Hadron-Hadron Scattering

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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 ¯, in proton-proton collisions at s = 13 TeV with the ATLAS detector. / ATLAS Collaboration ; Yexley, Melissa.
In: Journal of High Energy Physics, Vol. 2023, No. 7, 199, 26.07.2023.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{5bf19fc0c9fa4ee2b31ee302a483d30a,

title = "Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t → qX ( q = u, c ), with X → b b ¯, in proton-proton collisions at s = 13 TeV with the ATLAS detector",

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 → bb¯, 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 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.",

keywords = "Hadron-Hadron Scattering",

author = "{ATLAS Collaboration} and A.E. Barton and I.A. Bertram and G. Borissov and E.V. Bouhova-Thacker and H. Fox and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and P.A. Love and L. Meng and D. Muenstermann and K. Rybacki and M. Smizanska and S. Spinali and A.M. Wharton and Melissa Yexley",

year = "2023",

month = jul,

day = "26",

doi = "10.1007/jhep07(2023)199",

language = "English",

volume = "2023",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer Science and Business Media Deutschland GmbH",

number = "7",

}

RIS

TY - JOUR

T1 - Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t → qX ( q = u, c ), with X → b b ¯, in proton-proton collisions at s = 13 TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Barton, A.E.

AU - Bertram, I.A.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Fox, H.

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Meng, L.

AU - Muenstermann, D.

AU - Rybacki, K.

AU - Smizanska, M.

AU - Spinali, S.

AU - Wharton, A.M.

AU - Yexley, Melissa

PY - 2023/7/26

Y1 - 2023/7/26

N2 - 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 → bb¯, 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 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.

AB - 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 → bb¯, 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 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.

KW - Hadron-Hadron Scattering

U2 - 10.1007/jhep07(2023)199

DO - 10.1007/jhep07(2023)199

M3 - Journal article

VL - 2023

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 7

M1 - 199

ER -

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