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@ARTICLE{Hayrapetyan:642971,
      author       = {Hayrapetyan, Aram and others},
      collaboration = {{CMS Collaboration}},
      title        = {{D}etermination of the spin and parity of all-charm
                      tetraquarks},
      journal      = {Nature},
      volume       = {648},
      number       = {8092},
      issn         = {0028-0836},
      address      = {London [u.a.]},
      publisher    = {Nature Publ. Group},
      reportid     = {PUBDB-2025-05761, arXiv:2506.07944. CMS-BPH-24-002.
                      CERN-EP-2025-118},
      pages        = {58 - 63},
      year         = {2025},
      abstract     = {The traditional quark model$^{1,2}$ accounts for the
                      existence of baryons, such as protons and neutrons, which
                      consist of three quarks, as well as mesons, composed of a
                      quark–antiquark pair. Only recently has substantial
                      evidence started to accumulate for exotic states composed of
                      four or five quarks and antiquarks$^{3}$. The exact nature
                      of their internal structure remains uncertain$^{4, 5, 6, 7,
                      8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
                      23, 24, 25, 26, 27, 28–29}$. Here we report the first
                      measurement of quantum numbers of the recently discovered
                      family of three all-charm tetraquarks$^{30, 31–32}$, using
                      data collected by the CMS experiment at the Large Hadron
                      Collider from 2016 to 2018 (refs. $^{33,34}$). The angular
                      analysis techniques developed for the discovery and
                      characterization of the Higgs boson$^{35, 36–37}$ have
                      been applied to the new exotic states. Here we show that the
                      quantum numbers for parity P and charge conjugation C
                      symmetries are found to be +1. The spin J of these exotic
                      states is determined to be consistent with 2ħ, while 0ħ
                      and 1ħ are excluded at 95\% and 99\% confidence levels,
                      respectively. The J$^{PC}$ = 2$^{++}$ assignment implies
                      particular configurations of constituent spins and orbital
                      angular momenta, which constrain the possible internal
                      structure of these tetraquarks.},
      cin          = {CMS},
      ddc          = {500},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      HIDSS-0002 - DASHH: Data Science in Hamburg - Helmholtz
                      Graduate School for the Structure of Matter
                      $(2019_IVF-HIDSS-0002)$ / DFG project G:(GEPRIS)390833306 -
                      EXC 2121: Quantum Universe (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / $G:(DE-HGF)2019_IVF-HIDSS-0002$ /
                      G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2506.07944},
      howpublished = {arXiv:2506.07944},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2506.07944;\%\%$},
      doi          = {10.1038/s41586-025-09711-7},
      url          = {https://bib-pubdb1.desy.de/record/642971},
}