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

Aad, G.Abbott, B.Abeling, K.Abidi, S.H.Aboulhorma, A.Abramowicz, H.Abreu, H.Abulaiti, Y.Hoffman, A.C.A.Acharya, B.S.Bourdarios, C.A.Adamczyk, L.Adamek, L.Addepalli, S.V.Adelman, J.Adiguzel, A.Adorni, S.Adye, T.Affolder, A.A.Afik, Y.et al.2024-11-052024-11-052023European Physical Journal C, 2023; 83(11):1075-1-1075-351434-60441434-6052https://hdl.handle.net/2440/143144A search for pair-produced scalar or vector leptoquarks decaying into a b-quark and a τ -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 √s = 13 TeV. Events in which at least one τ -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% confidencelevel upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio B into a τ -lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming B = 100%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.en© CERN for the benefit of The ATLAS Collaboration 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development.pair-produced scalar; vector leptoquarksSearch for pair production of third-generation leptoquarks decaying into a bottom quark and a $$\tau $$-lepton with the ATLAS detectorJournal article10.1140/epjc/s10052-023-12104-72024-11-05677342Filmer, E.K. [0000-0001-6967-7325]Jackson, P. [0000-0002-0847-402X]Kong, A.X.Y. [0000-0001-8063-8765]McDougall, A.E. [0000-0001-7713-2800]Oliver, J.L. [0000-0002-0713-6627]Potti, H. [0000-0002-0800-9902]Ruggeri, T.A. [0000-0001-9941-1966]Ting, E.X.L. [0000-0002-5886-6339]White, M.J. [0000-0001-5474-4580]