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@ARTICLE{Aaij:474184,
      author       = {Aaij, Roel and others},
      collaboration = {{LHCb Collaboration}},
      title        = {{O}bservation of new excited ${{B}} ^0_{s} $ states},
      journal      = {The European physical journal / C},
      volume       = {81},
      number       = {7},
      issn         = {1434-6044},
      address      = {Heidelberg},
      publisher    = {Springer},
      reportid     = {PUBDB-2022-00574, arXiv:2010.15931. LHCb-PAPER-2020-026.
                      CERN-EP-2020-185},
      pages        = {601},
      year         = {2021},
      note         = {Eur. Phys. J. C81 (2021) 601. All figures and tables, along
                      with any supplementary material and additional information,
                      are available at
                      https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-026.html
                      (LHCb public pages)},
      abstract     = {A structure is observed in the ${B} ^{\pm }{K} ^{\mp }$
                      mass spectrum in a sample of proton–proton collisions at
                      centre-of-mass energies of 7, 8, and 13 TeV, collected with
                      the LHCb detector and corresponding to a total integrated
                      luminosity of 9$\,\text {fb} ^{-1}$. The structure is
                      interpreted as the result of overlapping excited ${B} ^0_{s}
                      $ states. With high significance, a two-peak hypothesis
                      provides a better description of the data than a single
                      resonance. Under this hypothesis the masses and widths of
                      the two states, assuming they decay directly to ${B} ^{\pm
                      }{K} ^{\mp }$, are determined to be $\begin{aligned} m_1\&=
                      6063.5 \pm 1.2 \text { (stat)} \pm 0.8\text { (syst)}\,\text
                      {Me}\text {V}, \\ \Gamma _1\&= 26 \pm 4 \text { (stat)} \pm
                      4\text { (syst)}\,\text {Me}\text {V}, \\ m_2\&= 6114 \pm 3
                      \text { (stat)} \pm 5\text { (syst)}\,\text {Me}\text {V},
                      \\ \Gamma _2\&= 66 \pm 18 \text { (stat)} \pm 21\text {
                      (syst)}\,\text {Me}\text {V}. \end{aligned}$Alternative
                      values assuming a decay through ${B} ^{*\pm }{K} ^{\mp }$,
                      with a missing photon from the $B^{*\pm } \rightarrow B^{\pm
                      }\gamma $ decay, which are shifted by approximately
                      45$\,\text {Me}$V, are also determined. The possibility of a
                      single state decaying in both channels is also considered.
                      The ratio of the total production cross-section times
                      branching fraction of the new states relative to the
                      previously observed $B_{s2}^{*0}$ state is determined to be
                      $0.87 \pm 0.15 \text { (stat)} \pm 0.19 \text { (syst)}$.},
      keywords     = {p p: scattering (INSPIRE) / p p: colliding beams (INSPIRE)
                      / B/s0: excited state (INSPIRE) / structure (INSPIRE) /
                      cross section: branching ratio: measured (INSPIRE) / mass
                      spectrum: (B+ K-) (INSPIRE) / mass: width (INSPIRE) / photon
                      (INSPIRE) / LHC-B (INSPIRE) / CERN LHC Coll (INSPIRE) /
                      experimental results (INSPIRE) / 7000 GeV-cms (INSPIRE) /
                      8000 GeV-cms (INSPIRE) / 13000 GeV-cms (INSPIRE)},
      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       = {2010.15931},
      howpublished = {arXiv:2010.15931},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2010.15931;\%\%$},
      UT           = {WOS:000691564500002},
      doi          = {10.1140/epjc/s10052-021-09305-3},
      url          = {https://bib-pubdb1.desy.de/record/474184},
}