Search for vector-like quarks in events with two oppositely charged leptons and jets in proton–proton collisions at 𝑠√=13TeV

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Issue Date
2019-04-26Author
Sirunyan, A. M.
Sanders, Stephen J.
CMS Collaboration
Publisher
SpringerOpen
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
© CERN for the benefit of the CMS collaboration 2019.
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A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton–proton collisions at 𝑠√=13TeV. The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9fb−1. Final states studied for TT⎯⎯⎯⎯ production include those where one of the T quarks decays via T→tZ and the other via T→bW, tZ, or tH, where H is a Higgs boson. For the BB⎯⎯⎯⎯ case, final states include those where one of the B quarks decays via B→bZ and the other B→tW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T→tZ, and B→bZ, T and B quark mass values below 1280 and 1130GeV, respectively, are excluded.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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Citation
Sirunyan, A.M., Tumasyan, A., Adam, W. et al. Search for vector-like quarks in events with two oppositely charged leptons and jets in proton–proton collisions at 𝑠√=13TeV. Eur. Phys. J. C 79, 364 (2019). https://doi.org/10.1140/epjc/s10052-019-6855-8
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