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@ARTICLE{Aad:598837,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{O}bservation of an {E}xcess of {D}icharmonium {E}vents in
                      the {F}our-{M}uon {F}inal {S}tate with the {ATLAS}
                      {D}etector},
      journal      = {Physical review letters},
      volume       = {131},
      number       = {15},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2023-07031, arXiv:2304.08962. CERN-EP-2023-035},
      pages        = {151902},
      year         = {2023},
      note         = {Phys. Rev. Lett. 131 (2023) 151902. 32 pages in total,
                      author list starting page 15, 5 figures, 3 tables, published
                      in 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, $J/ψ + J/ψ → 4μ$ and $J/ψ
                      + ψ(2S) → 4μ$, 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/ψ 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
                      $J/ψ + ψ(2S)$ 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},
      ddc          = {530},
      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)16},
      eprint       = {2304.08962},
      howpublished = {arXiv:2304.08962},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2304.08962;\%\%$},
      pubmed       = {pmid:37897770},
      UT           = {WOS:001102901700001},
      doi          = {10.1103/PhysRevLett.131.151902},
      url          = {https://bib-pubdb1.desy.de/record/598837},
}