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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 √s=13 TeV with the ATLAS detector

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F23%3A73621751" target="_blank" >RIV/61989592:15310/23:73621751 - isvavai.cz</a>

  • Result on the web

    <a href="https://link.springer.com/article/10.1007/JHEP07(2023)199" target="_blank" >https://link.springer.com/article/10.1007/JHEP07(2023)199</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/JHEP07(2023)199" target="_blank" >10.1007/JHEP07(2023)199</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    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 √s=13 TeV with the ATLAS detector

  • Original language description

    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 -&gt; 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 -&gt; uX) and between 0.018% and 0.078% for the branching fraction B(t -&gt; cX), for masses of the scalar particle X between 20 and 160 GeV.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10303 - Particles and field physics

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2023

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    JOURNAL OF HIGH ENERGY PHYSICS

  • ISSN

    1029-8479

  • e-ISSN

  • Volume of the periodical

    2023

  • Issue of the periodical within the volume

    7

  • Country of publishing house

    IT - ITALY

  • Number of pages

    51

  • Pages from-to

    "199-1"-"199-51"

  • UT code for WoS article

    001061847500001

  • EID of the result in the Scopus database

    2-s2.0-85174264679