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Title :Lattice QCD Study for the Interquark Force in Three-Quark and Multi-Quark Systems
Authors :Suganuma, H.
Takahashi, T.T.
Okiharu, F.
Ichie, H.
Publisher :American Institute of Physics
Issue Date :2005
Journal Title :AIP Conference Proceedings
Volume :756
Issue :1
Start Page :123
End Page :132
ISSN :0094-243X
Abstract :We 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.
Keywords :lattice QCD
inter-quark potential
multi-quark
gluonic excitation
confinement
string
Type Local :会議発表論文
Language :eng
Format :application/pdf
URI :http://hdl.handle.net/10191/30873
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/30873/1/756_1_123-132.pdf
DOI :info:doi/10.1063/1.1920939
Rights :Copyright(C)2005 American Institute of Physics
Appears in Collections:99 その他学会発表資料

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/30873