Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/139852
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Type: | Journal article |
Title: | Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t → qX (q = u, c), with X → bb¯ in proton-proton collisions at √ = 13 TeV with the ATLAS detector |
Other Titles: | Search for a new scalar resonance in flavour-changing neutral-current top-quark decays t -> qX (q = u, c), with X -> bb -bar in proton-proton collisions at root = 13 TeV with the ATLAS detector |
Author: | Aad, G. Abbott, B. Abbott, D.C. Abeling, K. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Abusleme Hoffman, A.C. Acharya, B.S. Achkar, B. Adam Bourdarios, C. Adamczyk, L. Adamek, L. Addepalli, S.V. Adelman, J. Adiguzel, A. Adorni, S. Adye, T. et al. |
Citation: | The Journal of High Energy Physics, 2023; 2023(7):199-0-199-50 |
Publisher: | Springer-Verlag |
Issue Date: | 2023 |
ISSN: | 1029-8479 1029-8479 |
Statement of Responsibility: | G. Aad ... E. K. Filmer ... P. Jackson ... A. X. Y. Kong ... H. Potti ... T. A. Ruggeri ... E. X. L. Ting ... M. J. White ... et al. (The ATLAS collaboration) |
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 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. |
Keywords: | Hadron-Hadron Scattering |
Description: | Published: July 26, 2023 |
Rights: | Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
DOI: | 10.1007/jhep07(2023)199 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1007/jhep07(2023)199 |
Appears in Collections: | Physics publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_139852.pdf | Published version | 1.81 MB | Adobe PDF | View/Open |
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