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001     18592
005     20240610120724.0
024 7 _ |a 10.1016/j.physletb.2011.03.014
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024 7 _ |a arXiv:1101.1983
|c hep-ph
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024 7 _ |a 2128/10293
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035 _ _ |9 arXiv
|a arXiv:1101.1983
|c hep-ph
035 _ _ |a SLAC-PUB-14347
035 _ _ |a FZJ-IKP-TH-2011-01
037 _ _ |a PreJuSER-18592
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Physics, Multidisciplinary
100 1 _ |0 P:(DE-HGF)0
|a Brodsky, S. J.
|b 0
245 _ _ |a Isospin splittings of doubly heavy baryons
260 _ _ |a Amsterdam
|b North-Holland Publ.
|c 2011
300 _ _ |a 251 - 255
336 7 _ |a Journal Article
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336 7 _ |a article
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440 _ 0 |0 4934
|a Physics Letters B
|v 698
|x 0370-2693
|y 3
500 _ _ |a 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.
520 _ _ |a 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.
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536 _ _ |0 G:(EU-Grant)227431
|2 European Community
|a European Community: 227431
|c 227431
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588 _ _ |a Dataset connected to Web of Science
650 _ 7 |2 INSPIRE
|a baryon: heavy
650 _ 7 |2 INSPIRE
|a isospin
650 _ 7 |2 INSPIRE
|a charmed baryon: bottom baryon
650 _ 7 |2 INSPIRE
|a charm: 2
650 _ 7 |2 INSPIRE
|a bottom: 2
650 _ 7 |2 INSPIRE
|a baryon: mass difference
650 _ 7 |2 INSPIRE
|a pentaquark
653 2 0 |2 Author
|a Doubly heavy baryons
653 2 0 |2 Author
|a Isospin splitting
653 2 0 |2 Author
|a Heavy quark-diquark symmetry
700 1 _ |0 P:(DE-HGF)0
|a Guo, F.-K.
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700 1 _ |0 P:(DE-Juel1)131182
|a Hanhart, C.
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700 1 _ |0 P:(DE-Juel1)131252
|a Meißner, U.-G.
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|g Vol. 698, p. 251 - 255
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856 7 _ |u http://dx.doi.org/10.1016/j.physletb.2011.03.014
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