% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Aaij:473746,
      author       = {Aaij, Roel and others},
      collaboration = {{LHCb Collaboration}},
      title        = {{O}bservation of {M}ultiplicity {D}ependent {P}rompt
                      $\chi_{c1}(3872)$ and $\psi(2{S})$ {P}roduction in $pp$
                      {C}ollisions},
      journal      = {Physical review letters},
      volume       = {126},
      number       = {9},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2022-00226, arXiv:2009.06619. LHCb-PAPER-2020-023.
                      CERN-EP-2020-161},
      pages        = {092001},
      year         = {2021},
      note         = {Phys. Rev. Lett. 126, 092001 (2021). All figures and
                      tables, along with any supplementary material and additional
                      information, are available at
                      https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-023.html
                      (LHCb public pages)},
      abstract     = {The production of $χ_{c1}$(3872) and $ψ$(2S) hadrons is
                      studied as a function of charged particle multiplicity in pp
                      collisions at a center-of-mass energy of 8 TeV,
                      corresponding to an integrated luminosity of 2 fb-1. For
                      both states, the fraction that is produced promptly at the
                      collision vertex is found to decrease as charged particle
                      multiplicity increases. The ratio of $χ_{c1}$(3872) to
                      $ψ$(2S) cross sections for promptly produced particles is
                      also found to decrease with multiplicity, while no
                      significant dependence on multiplicity is observed for the
                      equivalent ratio of particles produced away from the
                      collision vertex in b-hadron decays. This behavior is
                      consistent with a calculation that models the
                      $χ_{c1}$(3872) structure as a compact tetraquark.
                      Comparisons with model calculations and implications for the
                      binding energy of the $χ_{c1}$(3872) state are discussed.},
      keywords     = {p p: colliding beams (INSPIRE) / charged particle:
                      multiplicity (INSPIRE) / p p: scattering (INSPIRE) /
                      psi(3685): hadroproduction (INSPIRE) / X(3872):
                      hadroproduction (INSPIRE) / multiplicity: dependence
                      (INSPIRE) / binding energy (INSPIRE) / cross section: ratio:
                      measured (INSPIRE) / LHC-B (INSPIRE) / CERN LHC Coll
                      (INSPIRE) / numerical calculations: Monte Carlo (INSPIRE) /
                      experimental results (INSPIRE) / 8000 GeV-cms (INSPIRE) /
                      Elementary Particles and Fields (autogen)},
      cin          = {IT},
      ddc          = {530},
      cid          = {I:(DE-H253)IT-20120731},
      pnm          = {6G9 - IDAF (DESY) (POF4-6G9)},
      pid          = {G:(DE-HGF)POF4-6G9},
      experiment   = {EXP:(DE-H253)TIER-II-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2009.06619},
      howpublished = {arXiv:2009.06619},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2009.06619;\%\%$},
      pubmed       = {pmid:33750184},
      UT           = {WOS:000627618200008},
      doi          = {10.1103/PhysRevLett.126.092001},
      url          = {https://bib-pubdb1.desy.de/record/473746},
}