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



Aad, G, Abbott, B, Abbott, DC, Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2944 more authors) (2020) Search for <i>t</i>(<i>t</i>)over-bar resonances in fully hadronic final states in pp collisions at √<i>s</i>=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 10 (10). 61-.

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Abstract

This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb$^{-1}$ of proton--proton collision data recorded at a centre-of-mass energy of $\sqrt{s}=13$ 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 $t\bar{t}$ 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 $Z'$ boson in a topcolor-assisted-technicolor model. The $Z'$ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.

Item Type: Article
Additional Information: 40 pages in total, author list starting page 24, 4 figures, 2 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-48/
Uncontrolled Keywords: Jet substructure, Beyond Standard Model, Hadron-Hadron scattering (experiments), Heavy quark production, Jets
Depositing User: Symplectic Admin
Date Deposited: 02 Nov 2020 11:26
Last Modified: 17 Oct 2023 10:03
DOI: 10.1007/JHEP10(2020)061
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP10...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3105908