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@ARTICLE{Aad:589412,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{O}bservation of an excess of di-charmonium events in the
                      four-muon final state with the {ATLAS} detector},
      reportid     = {PUBDB-2023-05168, arXiv:2304.08962. CERN-EP-2023-035},
      year         = {2023},
      note         = {31 pages in total, author list starting page 14, 3 figures,
                      3 tables, submitted to Phys. Rev. Lett. All figures
                      including auxiliary figures are available at
                      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2022-01/},
      abstract     = {A search is made for potential $cc\bar{c}\bar{c}$
                      tetraquarks decaying into a pair of charmonium states in the
                      four muon final state using proton-proton collision data at
                      $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity
                      of 140 fb$^{-1}$ recorded by the ATLAS experiment at LHC.
                      Two decay channels, $J/\psi+J/\psi \rightarrow 4\mu$ and
                      $J/\psi+\psi(2S) \rightarrow 4\mu$, are studied. Backgrounds
                      are estimated based on a hybrid approach involving Monte
                      Carlo simulations and data-driven methods. Statistically
                      significant excesses are seen in the di-$J/\psi$ 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 $J/\psi$+$\psi$(2S) channel. The fitted
                      masses and decay widths of the structures are reported.},
      keywords     = {p p: colliding beams (INSPIRE) / resonance: production
                      (INSPIRE) / mass: width (INSPIRE) / (4muon): final state
                      (INSPIRE) / p p: scattering (INSPIRE) / J/psi(3100): pair
                      production (INSPIRE) / J/psi(3100): leptonic decay (INSPIRE)
                      / muon: pair production (INSPIRE) / numerical calculations:
                      Monte Carlo (INSPIRE) / ATLAS (INSPIRE) / structure
                      (INSPIRE) / psi(3685): leptonic decay (INSPIRE) /
                      charmonium: pair production (INSPIRE) / hybrid (INSPIRE) /
                      tetraquark (INSPIRE) / CERN LHC Coll (INSPIRE) / narrow
                      resonance (INSPIRE) / resonance: mass: measured (INSPIRE) /
                      resonance: width (INSPIRE) / width: measured (INSPIRE) /
                      background (INSPIRE) / data analysis method (INSPIRE) /
                      experimental results (INSPIRE) / 13000 GeV-cms (INSPIRE)},
      cin          = {ATLAS},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2304.08962},
      howpublished = {arXiv:2304.08962},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2304.08962;\%\%$},
      doi          = {10.3204/PUBDB-2023-05168},
      url          = {https://bib-pubdb1.desy.de/record/589412},
}