The effects of the quark-antiquark pairs on the hadron properties

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We have investigated the negative-parity baryonΛ(1405) and the recently found X(3872) and Zb±mesons. We considerΛ(1405) to be a superposition of the three-quark state and the baryon-meson state, and X(3872) to be that of the c-cbar core and two-meson state. In both of the cases, the observed features of the resonances are reproduced including a large isospin symmetry breading found in the X(3872) decay mode. The Zb±resonance can also be reproduced using the interaction consistent with that of X(3872).