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Search for pair production of third-generation leptoquarks decaying into a bottom quark and a $τ$-lepton with the ATLAS detector

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ATLAS Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2023). Search for pair production of third-generation leptoquarks decaying into a bottom quark and a $τ$-lepton with the ATLAS detector. European Physical Journal C, 83, 1075. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2023-43.


Cite as: https://hdl.handle.net/21.11116/0000-000F-114E-7
Abstract
A search for pair-produced scalar or vector leptoquarks decaying into a $b$-quark and a $\tau$-lepton is presented using the full LHC Run 2 (2015-2018) data sample of 139 fb$^{-1}$ collected with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV. Events in which at least one $\tau$-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 into the $\tau$-lepton. For scalar leptoquarks, masses below 1490 GeV are excluded assuming a 100% branching ratio, while for vector leptoquarks the corresponding limit is 1690 GeV (1960 GeV) in the minimal-coupling (Yang-Mills) scenario.