Aaboud, M.Aad, G.Abbott, B.Abbott, D. C.Abdinov, O.Abhayasinghe, D. K.Abidi, S. H.Izen, Joseph M.Meirose, BernhardReeves, KendallATLAS Collaboration2020-03-042020-03-042019-06-071434-6044http://dx.doi.org/10.1140/epjc/s10052-019-6962-6https://hdl.handle.net/10735.1/7340This paper describes a search for pairs of neutral, long-lived particles decaying in the ATLAS calorimeter. Long-lived particles occur in many extensions to the Standard Model and may elude searches for new promptly decaying particles. The analysis considers neutral, long-lived scalars with masses between 5 and 400 GeV, produced from decays of heavy bosons with masses between 125 and 1000 GeV, where the long-lived scalars decay into Standard Model fermions. The analysis uses either 10.8 fb⁻¹ or 33.0 fb⁻¹ of data (depending on the trigger) recorded in 2016 at the LHC with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of 13 TeV. No significant excess is observed, and limits are reported on the production cross section times branching ratio as a function of the proper decay length of the long-lived particles. © 2019, CERN for the benefit of the ATLAS collaboration.enCC BY 4.0 (Attribution)©2019 CERN for the benefit of the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/Scalar field theoryStandard model (Nuclear physics)BosonsFermionsLarge Hadron Collider (France and Switzerland)Proton-proton interactionsBranching ratios (Nuclear physics)articleAaboud, M., G. Aad, B. Abbott, D. C. Abbott, et al. 2019. "Search for long-lived neutral particles in pp collisions at √s=13TeV that decay into displaced hadronic jets in the ATLAS calorimeter." European Physical Journal C 79(6): art. 481, doi: 10.1140/epjc/s10052-019-6962-6796