Stable double-heavy tetraquarks: spectrum and structure

Bound states of double-heavy tetraquarks are studied in a constituent quark model. Two bound states are found for isospin and spin-parity I(J^P ) = 0(1^+) in the bb\bar{u}\bar{d} channel. One is deeply bound and compact made of colored diquarks, while the other is shallow and extended as a BB^* mole...

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Veröffentlicht in:arXiv.org 2020-09
Hauptverfasser: Meng, Q, Hiyama, E, Hosaka, A, Oka, M, Gubler, P, Can, K U, Takahashi, T T, Zong, H S
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Sprache:eng
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Zusammenfassung:Bound states of double-heavy tetraquarks are studied in a constituent quark model. Two bound states are found for isospin and spin-parity I(J^P ) = 0(1^+) in the bb\bar{u}\bar{d} channel. One is deeply bound and compact made of colored diquarks, while the other is shallow and extended as a BB^* molecule. The former agrees well with lattice QCD results. A systematic decrease in the binding energy is seen by replacing one of the heavy quarks to a lighter one. Altogether we find ten bound states. It is shown for the first time that hadrons with totally different natures emerge from a single Hamiltonian.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.14493