@article{oai:niigata-u.repo.nii.ac.jp:00002315,
 author = {Okiharu, Fumiko and Suganuma, Hideo and Takahashi, Toru T.},
 issue = {014505},
 journal = {Physical Review D, Physical Review D},
 month = {Jul},
 note = {"We perform the detailed study of the tetraquark (4Q) potential V_<4Q> for various QQ-Q^^-Q^^- systems in SU(3) lattice QCD with β =  6.0 and 16^3 × 32 at the quenched level. For about 200 different patterns of 4Q systems, V_<4Q> is extracted from the 4Q Wilson loop in 300 gauge configurations, with the smearing method to enhance the ground-state component. We calculate V_<4Q> for planar, twisted, asymmetric, and\nlarge-size 4Q configurations, respectively. Here, the calculation for large-size 4Q configurations is done by identifying 16^2 × 32 as the spatial size and 16 as the temporal one, and the long-distance confinement force is particularly analyzed in terms of the flux-tube picture. When QQ and Q^^-Q^^- are well separated, V_<4Q> is found to be expressed as the sum of the one-gluon-exchange Coulomb term and multi-Y-type linear term based on the flux-tube picture. When the nearest quark and antiquark pair is spatially close, the system is described as a ‘‘two-meson’’ state. We observe a flux-tube recombination called a ‘‘flip-flop’’ between the connected 4Q state and the two-meson state around the level-crossing point. This leads to infrared screening of the long-range color forces between (anti)quarks belonging to different mesons, and results in the absence of the color van der Waals force between two mesons."},
 pages = {1--17},
 title = {Detailed analysis of the tetraquark potential and flip-flop in SU(3) lattice QCD},
 volume = {72},
 year = {2005}
}