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Combination of the Searches for Pair-Produced Vectorlike Partners of the Third-Generation Quarks at root s=13 TeV with the ATLAS Detector

Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; ... Zwalinski, L; + view all (2018) Combination of the Searches for Pair-Produced Vectorlike Partners of the Third-Generation Quarks at root s=13 TeV with the ATLAS Detector. Physical Review Letters , 121 (21) , Article 211801. 10.1103/PhysRevLett.121.211801. Green open access

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Abstract

A combination of the searches for pair-produced vectorlike partners of the top and bottom quarks in various decay channels (T → Zt=Wb=Ht, B → Zb=Wt=Hb) is performed using 36.1 fb−1 of pp collision data at ffiffi s p ¼ 13 TeV with the ATLAS detector at the Large Hadron Collider. The observed data are found to be in good agreement with the standard model background prediction in all individual searches. Therefore, combined 95% confidence-level upper limits are set on the production cross section for a range of vectorlike quark scenarios, significantly improving upon the reach of the individual searches. Modelindependent limits are set assuming the vectorlike quarks decay to standard model particles. A singlet T is excluded for masses below 1.31 TeV and a singlet B is excluded for masses below 1.22 TeV. Assuming a weak isospin ðT;BÞ doublet and jVTbj ≪ jVtBj, T and B masses below 1.37 TeV are excluded.

Type: Article
Title: Combination of the Searches for Pair-Produced Vectorlike Partners of the Third-Generation Quarks at root s=13 TeV with the ATLAS Detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.121.211801
Publisher version: http://doi.org/10.1103/PhysRevLett.121.211801
Language: English
Additional information: Copyright © 2018 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/10064016
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