UC Irvine

A search for pair-produced scalar or vector leptoquarks decaying into a b-quark and a τ$$\tau $$-lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb-1$$^{-1}$$ collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of s=13$$\sqrt{s} =13$$ TeV. Events in which at least one τ$$\tau $$-lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio B$$\mathcal {B}$$ into a τ$$\tau $$-lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming B=100$$\mathcal {B}=100$$%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.