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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Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; ...Date
2020-10-09Source Title
The Journal of High Energy PhysicsPublisher
SPRINGERUniversity 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 HaAffiliation
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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 AccessAbstract
<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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