arXiv:1903.10253·v2·High Energy Physics — Phenomenology
The Hydrogen Bond of QCD
L. Maiani🇮🇹 · A. D. Polosa🇮🇹 · V. Riquer🇮🇹
Abstract
Using the Born-Oppenheimer approximation, we show that exotic resonances, X and Z, may emerge as QCD molecular objects made of colored two-quark lumps, states with heavy-light diquarks spatially separated from antidiquarks. With the same method we confirm that doubly heavy tetraquarks are stable against strong decays. Tetraquarks described here provide a new picture of exotic hadrons, as formed by the QCD analog of the hydrogen bond of molecular physics.
Comments: 5 pages, 3 figures, comments and references added. Table 1 extended