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Spectrum of the fully-heavy tetraquark state $QQar Q' ar Q'$ | | Guang-Juan Wang
; Lu Meng
; Shi-Lin Zhu
; | | Date: |
11 Jul 2019 | | Abstract: | In this work, we systematically calculate the mass spectra of the $S$-wave
fully heavy tetraquark states $bbar bar b$, $ccar car c$, and $bbar
car c$ in two nonrelativistic quark models. A tetraquark state may be an
admixture of a $6_c-ar 6_c$ state and a $ar 3_c-3_c$ one, where $6_c-ar
6_c$($ar 3_c-3_c$) denotes the color configuration with a $6_c$ ($ar 3_c$)
diquark and a $ar 6_c$ ($3_c$) antidiquark. For the tetraquark states $bbar
bar b$ and $ccar car c$ with $J^{PC}={0^{++}}$, the $6_c-ar 6_c$ state
is lower than the $ar 3_c-3_c$ one in both the two quark models, while the
order of the $bbar car c$ states depend on models. The $6_c-ar 6_c$ and
$ar 3_c-3_c$ mixing effects are induced by the hyperfine interactions between
the diquark and antidiquark, while the contributions from the
one-gluon-exchange (OGE) Coulomb or the linear confinement potentials vanish
for the $QQar Q’ar Q’$ system. With the couple-channel effects, we obtain
the similar mass spectra. The numerical results show that the ground $QQar
Q’ar Q’$ ($Q=b,c$ and $Q’=b,c$) tetraquark states are located above the
corresponding scattering states, which indicates that there may not exist a
bound state in the scheme of the two quark models. | | Source: | arXiv, 1907.5177 | | Services: | Forum | Review | PDF | Favorites | |
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