Study for the pentaquark potential in SU(3) lattice QCD

We perform the first study of the static pentaquark (5Q) potential V-5Q in SU(3) quenched lattice QCD with 16(3)x32 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 Q (Q) over bar and 3Q potentials, we find a universality of the string tension, sigma(Q (Q) over bar)similar or equal to sigma(3Q)similar or equal to sigma(5Q), and the OGE result for Coulomb coefficients.