Search for tt¯ resonances in fully hadronic final states in pp collisions at s√ = 13 TeV with the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration Jet substructure Beyond Standard Model Hadron-Hadron scattering (experiments) Heavy quark production Jets 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 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 tt¯ 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. 2020-12-16T13:26:10Z 2020-12-16T13:26:10Z 2020-10-09 info:eu-repo/semantics/article Collaboration, A. T. L. A. S., Barton, A. E., Bouhova-Thacker, E. V., Fox, H., Henderson, R. C. W., Jones, R. W. L., ... & Parker, A. J. (2020). Search for tt¯ resonances in fully hadronic final states in pp collisions at√ s= 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2020(10). [DOI: 10.1007/JHEP10(2020)061] http://hdl.handle.net/10481/64960 10.1007/JHEP10(2020)061 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Springer