Study of the heavy molecular states in the quark model with meson exchange interaction

Some charmonium-like resonances such as X(3872) can be interpreted as possible D(()*())(D) over bar (()*()) molecular states. Within the quark model, we study the structure of such molecular states and the similar B(()*())(B) over bar (()*()) molecular states by taking into account the light meson exchange (pi, eta, rho, omega and sigma) between two light quarks from different mesons.