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Compact Muon Solenoid
LHC, CERN

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
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.
CMS Publications
Compact Muon Solenoid
LHC, CERN