• Open Access

Search for pair and single production of vectorlike quarks in final states with at least one Z boson decaying into a pair of electrons or muons in pp collision data collected with the ATLAS detector at s=13TeV

M. Aaboud et al. (ATLAS Collaboration)
Phys. Rev. D 98, 112010 – Published 20 December 2018

Abstract

A search for vectorlike quarks is presented, which targets their decay into a Z boson and a third-generation Standard Model quark. In the case of a vectorlike quark T (B) with charge +2/3e (1/3e), the decay searched for is TZt (BZb). Data for this analysis were taken during 2015 and 2016 with the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 36.1fb1 of pp collisions at s=13TeV. The final state used is characterized by the presence of b-tagged jets, as well as a Z boson with high transverse momentum, which is reconstructed from a pair of opposite-sign same-flavor leptons. Pair and single production of vectorlike quarks are both taken into account and are each searched for using optimized dileptonic exclusive and trileptonic inclusive event selections. In these selections, the high scalar sum of jet transverse momenta, the presence of high-transverse-momentum large-radius jets, as well as—in the case of the single-production selections—the presence of forward jets are used. No significant excess over the background-only hypothesis is found and exclusion limits at 95% confidence level allow masses of vectorlike quarks of mT>1030GeV (mT>1210GeV) and mB>1010GeV (mB>1140GeV) in the singlet (doublet) model. In the case of 100% branching ratio for TZt (BZb), the limits are mT>1340GeV (mB>1220GeV). Limits at 95% confidence level are also set on the coupling to Standard Model quarks for given vectorlike quark masses.

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  • Received 28 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.112010

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

Physics Subject Headings (PhySH)

  1. Physical Systems
Particles & Fields

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Vol. 98, Iss. 11 — 1 December 2018

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