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    Search for t(t)over-bar resonances in fully hadronic final states in pp collisions at root s=13 TeV with the ATLAS detector

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    Author
    Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; ...
    Date
    2020-10-09
    Source Title
    The Journal of High Energy Physics
    Publisher
    SPRINGER
    University of Melbourne Author/s
    Barberio, Luigia; Urquijo, Phillip; Taylor, Geoffrey; Ungaro, Francesca Consiglia; Shojaii, Seyed Ruhollah; McDonald, Emily; Scutti, Federico; Goldfarb, Steven; McNamara, Peter; Pham, Thu Le Ha
    Affiliation
    School of Physics
    Metadata
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    Document Type
    Journal Article
    Citations
    Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T. ,... Zwalinski, L. (2020). Search for t(t)over-bar resonances in fully hadronic final states in pp collisions at root s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2020 (10), https://doi.org/10.1007/JHEP10(2020)061.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252240
    DOI
    10.1007/JHEP10(2020)061
    Abstract
    <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> of proton-proton collision data recorded at a centre-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a <jats:inline-formula><jats:alternatives><jats:tex-math>$$ t\overline{t} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new <jats:italic>Z</jats:italic>′ boson in a topcolor-assisted-technicolor model. The <jats:italic>Z</jats:italic>′ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.</jats:p>

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