Aad, G.G.AadAbbott, B.B.AbbottAbeling, K.K.AbelingAbicht, N. J.N. J.AbichtAbidi, S. H.S. H.AbidiAboulhorma, A.A.AboulhormaAbramowicz, H.H.AbramowiczAbreu, H.H.AbreuAbulaiti, Y.Y.AbulaitiZwalinski, L.L.Zwalinski2024-02-272024-02-272024-02-16Journal of High Energy Physics. 2024 Feb 16;2024(2):128https://resolver.sub.uni-goettingen.de/purl?gro-2/141854This paper presents a search for a new Z′ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back as Standard Model particles. This analysis is based on proton-proton collision data recorded at$ \sqrt{s} $ = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb−1. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two highest-transverse-momentum jets is scanned to look for an excess above a data-driven estimate of the Standard Model multijet background. No significant excess of events is observed and the results are thus used to set 95% confidence-level upper limits on the production cross-section times branching ratio of the Z′ to dark quarks as a function of the Z′ mass for various dark-quark scenarios.enCC BY 4.0Beyond Standard ModelHadron-Hadron ScatteringDark MatterExoticsjournal_article10.1007/JHEP02(2024)1282024-02-25The Author(s)