title: Study for the pentaquark potential in SU(3) lattice QCD.
abstract: We perform the first study of the static pentaquark (5Q) potential V(5Q) in SU(3) quenched lattice QCD with 16(3) x 32 and beta = 6.0. From the 5Q Wilson loop, V(5Q) is calculated in a gauge-invariant manner, with the smearing method to enhance the ground-state component. V(5Q) is well described by the OGE-plus-multi-Y ansatz: a sum of the one-gluon-exchange (OGE) Coulomb term and the multi-Y-type linear term proportional to the minimal total length of the flux tube linking the five quarks. Comparing with QQ and3Q potentials, we find a universality of the string tension, sigma(QQ) approximately sigma(3Q) approximately sigma(5Q), and the OGE result for Coulomb coefficients.
authors.affiliation: Department of Physics, Nihon University, Chiyoda, Tokyo, Japan.
authors.forename: Fumiko
authors.initials: F
authors.lastname: Okiharu
authors.forename: Hideo
authors.initials: H
authors.lastname: Suganuma
authors.forename: Toru T
authors.initials: TT
authors.lastname: Takahashi