CMS-PAS-EXO-19-015

CMS-PAS-EXO-19-015
Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s} =$ 13 TeV
CMS Collaboration
July 2020

Abstract: A search for leptoquarks produced singly and in pairs in proton-proton collisions is presented. The leptoquark (LQ) may couple to a top quark plus a $\tau$ lepton (t $\tau$ ) or a bottom quark plus a neutrino (b $\nu$ , scalar LQ), or else to t $\nu$ or b $\tau$ (vector LQ), leading to the final states t $\tau\nu$ b and t $\tau\nu$ . The data were recorded by the CMS experiment at the CERN LHC at $\sqrt{s} =$ 13 TeV and correspond to an integrated luminosity of 137 fb $^{-1}$ . The data are found to be in agreement with the standard model background prediction. Lower limits at 95% CL are set on the LQ mass in the range 0.98-1.73 TeV, depending on the LQ spin and the LQ-lepton-quark vertex coupling $\lambda$ , and assuming equal branching fractions for the two LQ decay modes considered. These are the most stringent constraints on the existence of leptoquarks in this scenario.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Accepted by PLB. The superseded preliminary plots can be found here.

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