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



Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Eroe, J, Escalante Del Valle, A
et al (show 2273 more authors) (2019) Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at √<i>s</i>=13TeV. EUROPEAN PHYSICAL JOURNAL C, 79 (4). 364-.

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Abstract

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 = 13 Te . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 fb - 1 . Final states studied for T T ¯ production include those where one of the T quarks decays via T → t Z and the other via T → b W , t Z , or t H , where H is a Higgs boson. For the B B ¯ case, final states include those where one of the B quarks decays via B → b Z and the other B → t W , b Z , or b H . 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 → t Z , and B → b Z , T and B quark mass values below 1280 and 1130 Ge , respectively, are excluded.

Item Type: Article
Uncontrolled Keywords: CMS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 05 Dec 2019 17:29
Last Modified: 24 Jan 2024 13:16
DOI: 10.1140/epjc/s10052-019-6855-8
Open Access URL: https://doi.org/10.1140/epjc/s10052-019-6855-8
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3065045