Abstract
We extend the one pion exchange model at quark level to include the short distance contributions coming from {eta}, {sigma}, {rho} and {omega} exchange. This formalism is applied to discuss the possible molecular states of DD*/DD*, BB*/BB*, DD*, BB*, the pseudoscalar-vector systems with C=B=1 and C=-B=1 respectively. The ''{delta} function'' term contribution and the S-D mixing effects have been taken into account. We find the conclusions reached after including the heavier mesons exchange are qualitatively the same as those in the one pion exchange model. The previous suggestion that 1{sup ++} BB*/BB* molecule should exist, is confirmed in the one-boson exchange model, whereas DD* bound state should not exist. The DD*/DD* system can accommodate a 1{sup ++} molecule close to the threshold, the mixing between the molecule and the conventional charmonium has to be considered to identify this state with X(3872). For the BB* system, the pseudoscalar-vector systems with C=B=1 and C=-B=1, near threshold molecular states may exist. These bound states should be rather narrow, isospin is violated and the I=0 component is dominant. Experimental search channels for these states are suggested.
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