TY - JOUR
T1 - Doubly heavy tetraquark resonant states
AU - Meng, Qi
AU - Harada, Masayasu
AU - Hiyama, Emiko
AU - Hosaka, Atsushi
AU - Oka, Makoto
N1 - Funding Information:
This works is supported in part by Grants-in Aid for Scientific Research on Innovative Areas , No. 18H05407 for QM, EH, AH, No. 20K03927 for MH, and Nos. 19H05159 , 20K03959 and 21H00132 for MO.
Publisher Copyright:
© 2021 The Author(s)
PY - 2022/1/10
Y1 - 2022/1/10
N2 - Spectrum of the doubly heavy tetraquarks, bbq¯q¯, is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the BB⁎ and B⁎B⁎ thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity JP=1+ is found to be a mixed state of a compact tetraquark and a B⁎B⁎ scattering state. This is driven by a strong color Coulombic attraction between the bb quarks. Negative-parity excited resonances with JP=0−, 1− and 2− form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the λ-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.
AB - Spectrum of the doubly heavy tetraquarks, bbq¯q¯, is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the BB⁎ and B⁎B⁎ thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity JP=1+ is found to be a mixed state of a compact tetraquark and a B⁎B⁎ scattering state. This is driven by a strong color Coulombic attraction between the bb quarks. Negative-parity excited resonances with JP=0−, 1− and 2− form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the λ-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.
KW - Doubly heavy tetraquark
KW - Few-body problem
KW - Quark model
KW - Resonant states
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U2 - 10.1016/j.physletb.2021.136800
DO - 10.1016/j.physletb.2021.136800
M3 - Article
AN - SCOPUS:85120961296
VL - 824
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
M1 - 136800
ER -