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@ARTICLE{Brodsky:18592,
      author       = {Brodsky, S. J. and Guo, F.-K. and Hanhart, C. and Meißner,
                      U.-G.},
      title        = {{I}sospin splittings of doubly heavy baryons},
      journal      = {Physics letters / B},
      volume       = {698},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {PreJuSER-18592},
      pages        = {251 - 255},
      year         = {2011},
      note         = {We want to thank J. Gasser for helpful discussions and
                      U.-G.M. acknowledges a useful communication from H.
                      Leutwyler. S.J.B. is indebted to M. Karliner and H. Lipkin
                      for very helpful discussions on effective diquark models. We
                      also thank J. Engelfried, J.-P. Lansberg, A. Goldhaber and
                      J. Russ for comments. F.-K.G., C.H. and U.-G.M. would like
                      to thank the DFG (SFB/TR 16, "Subnuclear Structure of
                      Matter"), the HGF (Virtual Institute "Spin and Strong QCD",
                      VH-VI-231), and the European Community-Research
                      Infrastructure Integrating Activity "Study of Strongly
                      Interacting Matter" (acronym HadronPhysics2, Grant Agreement
                      No. 227431) under the Seventh Framework Programme of EU for
                      support. U.-G.M. also thanks the BMBF for support (grant
                      06BN9006). This research was also supported by the
                      Department of Energy, contract DE-AC02-76SF00515.},
      abstract     = {The SELEX Collaboration has reported a very large isospin
                      splitting of doubly charmed baryons. We show that this
                      effect would imply that the doubly charmed baryons are very
                      compact. One intriguing possibility is that such baryons
                      have a linear geometry Q-q-Q where the light quark q
                      oscillates between the two heavy quarks Q, analogous to a
                      linear molecule such as carbon dioxide. However, using
                      conventional arguments, the size of a heavy-light hadron is
                      expected to be around 0.5 fm, much larger than the size
                      needed to explain the observed large isospin splitting.
                      Assuming the distance between two heavy quarks is much
                      smaller than that between the light quark and a heavy one,
                      the doubly heavy baryons are related to the heavy mesons via
                      heavy quark-diquark symmetry. Based on this symmetry, we
                      predict the isospin splittings for doubly heavy baryons
                      including Xi(cc), Xi(bb) and Xi(bc). The prediction for the
                      Xi(cc) is much smaller than the SELEX value. On the other
                      hand, the Xi(bb) baryons are predicted to have an isospin
                      splitting as large as (6.3 +/- 1.7) MeV. An experimental
                      study of doubly bottomed baryons is therefore very important
                      to better understand the structure of baryons with heavy
                      quarks. (C) 2011 Elsevier B.V. All rights reserved.},
      keywords     = {baryon: heavy (INSPIRE) / isospin (INSPIRE) / charmed
                      baryon: bottom baryon (INSPIRE) / charm: 2 (INSPIRE) /
                      bottom: 2 (INSPIRE) / baryon: mass difference (INSPIRE) /
                      pentaquark (INSPIRE)},
      cin          = {IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-3-20111104},
      pnm          = {Physik der Hadronen und Kerne / European Community: 227431},
      pid          = {G:(DE-Juel1)FUEK413 / G:(EU-Grant)227431},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000289543700010},
      eprint       = {1101.1983},
      howpublished = {arXiv:1101.1983},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1101.1983;\%\%$},
      doi          = {10.1016/j.physletb.2011.03.014},
      url          = {https://juser.fz-juelich.de/record/18592},
}