Search for Scalar Leptoquark Pair Production Decaying into Top-Quarks and Leptons at √s = 13 TeV with ATLAS detector

Abstract

This contribution presents a search for pair-produced scalar leptoquarks decaying to leptons and hadronically decaying top quarks at the LHC using 139 fb$^{-1}$ of proton$-$proton collision data collected with the ATLAS detector at $\sqrt{s}=13$ TeV. Leptoquarks are predicted by various extensions of the Standard Model to draw the similarity between the quark and lepton sectors, and they provide a promising explanation for anomalies observed in both the lepton universality tests in $B$ decays and the muon anomalous magnetic moment measurement. Searches for pair-produced scalar leptoquarks decaying into electron$-$top or muon$-$top pairs have been performed in final states with exactly two leptons. A parameterized gradient boosted decision tree approach is used to suppress the Standard Model backgrounds. No excess over the Standard Model prediction was observed. Exclusion limits on the leptoquark masses are set at 1480 GeV and 1470 GeV for the electron and muon channel, respectively.