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.
Hydrogen bond of QCD / Maiani, L.; Polosa, A. D.; Riquer, V.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 100:1(2019). [10.1103/PhysRevD.100.014002]
Hydrogen bond of QCD
Polosa A. D.;Riquer V.
2019
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.File allegati a questo prodotto
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