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Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Sirunyan, Albert M , Tumasyan, Armen , Adam, Wolfgang , Bergauer, Thomas , Dragicevic, Marko , Erö, Janos , Escalante Del Valle, Alberto , Fruehwirth, Rudolf , Jeitler, Manfred , Krammer, Natascha
Phys.Lett.B 819 (2021) 136446, 2021.
https://doi.org/10.17182/hepdata.104980

Abstract
A search for leptoquarks produced singly and in pairs in proton-proton collisions is presented. We consider the leptoquark (LQ) to be a scalar particle of charge -1/3$e$ coupling to a top quark plus a tau lepton ($\mathrm{t}\tau$) or a bottom quark plus a neutrino ($\mathrm{b}\nu$), or a vector particle of charge +2/3$e$, coupling to $\mathrm{t}\nu$ or $\mathrm{b}\tau$. These choices are motivated by models that can explain a series of anomalies observed in the measurement of B meson decays. In this analysis the signatures $\mathrm{t}\tau\nu\mathrm{b}$ and $\mathrm{t}\tau\nu$ are probed, using data recorded by the CMS experiment at the CERN LHC at $\sqrt{s} =$ 13 TeV and that correspond to an integrated luminosity of 137 fb$^{-1}$. These signatures have not been previously explored in a dedicated search. The data are found to be in agreement with the standard model prediction. Lower limits at 95% confidence level are set on the LQ mass in the range 0.98-1.73 TeV, depending on the LQ spin and its coupling $\lambda$ to a lepton and a quark, and assuming equal branching fractions for the two LQ decay modes considered. These are the most stringent constraints to date on the existence of leptoquarks in this scenario.

  • Acceptance times efficiency for leptoquark pairs

    10.17182/hepdata.104980.v1/t1

    Pair leptoquark (LQ) total selection efficiency, accounting for both the decay branching fraction and the event selection, for events that...

  • Acceptance times efficiency for single scalar leptoquarks

    10.17182/hepdata.104980.v1/t2

    Single scalar leptoquark (LQs) total selection efficiency, accounting for both the decay branching fraction and the event selection, for events...

  • Acceptance times efficiency for single vector leptoquarks, k = 0

    10.17182/hepdata.104980.v1/t3

    Single vector leptoquark (LQv) k = 0 total selection efficiency, accounting for both the decay branching fraction and the event...

  • Acceptance times efficiency for single vector leptoquarks, k = 1

    10.17182/hepdata.104980.v1/t4

    Single vector leptoquark (LQv) k = 1 total selection efficiency, accounting for both the decay branching fraction and the event...

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