2022-08-08T03:57:49Zhttps://niigata-u.repo.nii.ac.jp/oaioai:niigata-u.repo.nii.ac.jp:000308792021-03-01T10:02:10ZLattice QCD Study for the Interquark Force in Three-Quark and Multi-Quark SystemsLattice QCD Study for the Interquark Force in Three-Quark and Multi-Quark SystemsSuganuma, H.Takahashi, T.T.Okiharu, F.Ichie, H.Copyright(C)2005 American Institute of Physicslattice QCDinter-quark potentialmulti-quarkgluonic excitationconfinementstringWe study three-quark and multi-quark potentials in SU(3) lattice QCD. From accurate calculations for more than 300 different patterns of 3Q systems, the static ground-state 3Q potential Vg����s���� 3Q is found to be well described by the Coulomb plus Y-type linear potential (Y-Ansatz) within 1%-level deviation. As a clear evidence for Y-Ansatz, Y-type flux-tube formation is actually observed on lattices in maximally-Abelian projected QCD. For about 100 patterns of 3Q systems, we perform accurate calculations for the 1st excited-state 3Q potential Ve����s���� 3Q by diagonalizing the QCD Hamiltonian in presence of three quarks, and find a large gluonic-excitation energy ΔE3Q ����Ve����s���� 3Q Vg����s���� 3Q of about 1 GeV, which gives a physical reason on success of the quark model. ΔE3Q is found to be reproduced by “inverse Mercedes Ansatz”, which indicates a complicated bulk excitation for the gluonic-excitation mode. We study also tetra-quark and penta-quark potentials in lattice QCD, and find that they are well described by the OGE Coulomb plus multi-Y type linear potential, which supports the flux-tube picture even for multi-quarks. Finally, narrow decay width of low-lying penta-quark baryons is discussed in terms of the QCD string theory.American Institute of Physics2005engconference paperhttp://hdl.handle.net/10191/30873https://niigata-u.repo.nii.ac.jp/records/30879info:doi/10.1063/1.1920939AA005029770094243XAIP Conference ProceedingsAIP Conference Proceedings7561123132https://niigata-u.repo.nii.ac.jp/record/30879/files/756_1_123-132.pdfapplication/pdf449.4 kB2019-08-26