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Hydrogen bond of QCD in doubly heavy baryons and tetraquarks

Luciano Maiani1,2,*, Antonio D. Polosa2,†, and Veronica Riquer1,2,‡

  • 1T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Dipartimento di Fisica and INFN, Sapienza Università di Roma, Piazzale Aldo Moro 2, I-00185 Roma, Italy

  • *luciano.maiani@roma1.infn.it
  • †antonio.polosa@roma1.infn.it
  • ‡veronica.riquer@cern.ch
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Phys. Rev. D 100, 074002 – Published 4 October, 2019

DOI: https://doi.org/10.1103/PhysRevD.100.074002

Abstract

In this paper we present in greater detail previous work on the Born-Oppenheimer approximation to treat the hydrogen bond of QCD, and add a similar treatment of doubly heavy baryons. Doubly heavy exotic resonances X and Z can be described as color molecules of two-quark lumps, the analogue of the H2 molecule, and doubly heavy baryons as the analog of the H2+ ion, except that the two heavy quarks attract each other. We compare our results with constituent quark model and lattice QCD calculations and find further evidence in support of this upgraded picture of compact tetraquarks and baryons.

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Phys. Rev. D 100, 074002– Published 4 October, 2019
  • Received 8 August 2019
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