Çetin, Serkant Ali2024-05-102024-05-102023-10-110031-9007https://hdl.handle.net/11411/5340https://doi.org/10.1103/PhysRevLett.131.151902A search is made for potential ccc? c? tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at ps ¼ 13 TeV, corresponding to an integrated luminosity of 140 fb?1 recorded by the ATLAS experiment at LHC. Two decay channels, J=? ? J=? ? 4? and J=? ? ? ?2S? ? 4?, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J=? channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J=? ? ? ?2S? channel. The fitted masses and decay widths of the structures are reported. © 2023 CERN, for the ATLAS Collaboration.eninfo:eu-repo/semantics/openAccessCharged particlesGermanium alloysGermanium compoundsIntelligent systemsArticle2-s2.0-8517527952710.1103/PhysRevLett.131.15190237897770Q1WOS:001102901700001