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

M. Aaboud et al. (ATLAS Collaboration)
Phys. Rev. Lett. 121, 211801 – Published 20 November 2018

Abstract

A combination of the searches for pair-produced vectorlike partners of the top and bottom quarks in various decay channels (TZt/Wb/Ht, BZb/Wt/Hb) is performed using 36.1fb1 of pp collision data at s=13TeV 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. Model-independent 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 (T,B) doublet and |VTb||VtB|, T and B masses below 1.37 TeV are excluded.

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  • Received 9 August 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.211801

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.

© 2018 CERN, for the ATLAS Collaboration

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Particles & Fields

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Vol. 121, Iss. 21 — 23 November 2018

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