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Search for vector-like quarks in events with two oppositely charged leptons and jets in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te

Author(s)
Sirunyan, A. M; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Del Valle, A. E; Flechl, M.; Frühwirth, R.; Ghete, V. M; Hrubec, J.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; ... Show more Show less
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Abstract
Abstract A search for the pair production of heavy vector-like partners $$\mathrm {T}$$ T and $$\mathrm {B}$$ B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 $$\,\text {fb}^{-1}$$ fb - 1 . Final states studied for $$\mathrm {T} \overline{\mathrm {T}} $$ T T ¯ production include those where one of the $$\mathrm {T}$$ T quarks decays via $$\mathrm {T} \rightarrow \mathrm {t}\mathrm {Z}$$ T → t Z and the other via $$\mathrm {T} \rightarrow \mathrm {b}\mathrm {W}$$ T → b W , $$\mathrm {t}\mathrm {Z}$$ t Z , or $$\mathrm {t}\mathrm {H} $$ t H , where $$\mathrm {H}$$ H is a Higgs boson. For the $$\mathrm {B} \overline{\mathrm {B}} $$ B B ¯ case, final states include those where one of the $$\mathrm {B}$$ B quarks decays via $$\mathrm {B} \rightarrow \mathrm {b}\mathrm {Z}$$ B → b Z and the other $$\mathrm {B} \rightarrow \mathrm {t}\mathrm {W}$$ B → t W , $$\mathrm {b}\mathrm {Z}$$ b Z , or $$\mathrm {b}\mathrm {H} $$ b H . Events with two oppositely charged electrons or muons, consistent with coming from the decay of a $$\mathrm {Z}$$ 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 $$\mathrm {T}$$ T and $$\mathrm {B}$$ B quarks for a range of branching fractions. Assuming 100% branching fractions for $$\mathrm {T} \rightarrow \mathrm {t}\mathrm {Z}$$ T → t Z , and $$\mathrm {B} \rightarrow \mathrm {b}\mathrm {Z}$$ B → b Z , $$\mathrm {T}$$ T and $$\mathrm {B}$$ B quark mass values below 1280 and 1130 $$\,\text {Ge}\text {V}$$ Ge , respectively, are excluded.
Date issued
2019-04-26
URI
https://hdl.handle.net/1721.1/131623
Department
Massachusetts Institute of Technology. Department of Physics
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2019 Apr 26;79(4):364
Version: Final published version

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