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@ARTICLE{Butenschoen:209177,
      author       = {Butenschoen, Mathias and He, Zhiguo and Kniehl, Bernd A.},
      title        = {$\eta_c$ production at the {LHC} challenges
                      nonrelativistic-{QCD} factorization},
      journal      = {Physical review letters},
      volume       = {114},
      number       = {9},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2015-02008, DESY-14-219. arXiv:1411.5287},
      pages        = {092004},
      year         = {2015},
      abstract     = {We analyze the first measurement of ${\eta }_{c}$
                      production, performed by the LHCb Collaboration, in the
                      nonrelativistic QCD (NRQCD) factorization framework at
                      next-to-leading order (NLO) in the strong-coupling constant
                      ${\alpha }_{s}$ and the relative velocity $v$ of the bound
                      quarks including the feeddown from ${h}_{c}$ mesons.
                      Converting the long-distance matrix elements extracted by
                      various groups from $J/\psi $ yield and polarization data to
                      the ${\eta }_{c}$ case using heavy-quark spin symmetry, we
                      find that the resulting NLO NRQCD predictions greatly
                      overshoot the LHCb data, while the color-singlet model
                      provides an excellent description.},
      keywords     = {quantum chromodynamics: nonrelativistic (INSPIRE) /
                      eta/c(2980) (INSPIRE) / heavy quark: spin (INSPIRE) / spin:
                      symmetry (INSPIRE) / strong interaction: coupling constant
                      (INSPIRE) / higher-order: 1 (INSPIRE) / factorization
                      (INSPIRE) / LHC-B (INSPIRE) / color: singlet (INSPIRE) /
                      strong coupling (INSPIRE) / CERN LHC Coll (INSPIRE) /
                      polarization (INSPIRE) / velocity (INSPIRE) / quark
                      (INSPIRE) / meson (INSPIRE)},
      cin          = {T},
      ddc          = {550},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)16},
      eprint       = {1411.5287},
      howpublished = {arXiv:1411.5287},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1411.5287;\%\%$},
      UT           = {WOS:000351288800002},
      pubmed       = {pmid:25793805},
      doi          = {10.1103/PhysRevLett.114.092004},
      url          = {https://bib-pubdb1.desy.de/record/209177},
}