Abstract
We study noncentral parts of the flavor-singlet interquark interactions induced by the instanton-light quark coupling and their effects on the P-wave multiquark systems: the negative parity baryons and the relative P-wave two-nucleon systems. It is found that the noncentral force from the instanton induced interaction reduces that from the one-gluon exchange in the excited P-wave nucleons. This cancellation does not occur in the spin-orbit force between nucleons, where the flavor-symmetric q-q interaction plays a dominant role. Also, the cancellation is weakened in the flavor-singlet negative-parity baryons by the threebody part of instanton induced interaction, which may lead larger separation seen between A(1405) and A(1520). 329
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