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Search for resonant production of dark quarks in the dijet final state with the ATLAS detector

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • ATLAS Collaboration
Article number128
<mark>Journal publication date</mark>16/02/2024
<mark>Journal</mark>Journal of High Energy Physics
Issue number2
Publication StatusPublished
<mark>Original language</mark>English


This 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 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.