X(1835) as Proton-Antiproton Bound State in Skyrme Model

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We present a review to the recent works related to interpreting the exotic particle X(1835) reported by BES as a NN-baryonium in the Skyrme model. There are two evidences that support this interpretation: 1) There exist a classical NN-Skyrmion solution with about 10MeV binding energies in the model; 2) The decay of this Skymion-baryonium is caused by annihilation of p-p inside X(1835) through the quantum tunneling effect, and hence the most favorable decay channels are X→ η4π or X→ η' 2π. These lead to reasonable interpreting the data of BES, and especially to useful prediction on the decay mode of X(1835) for the experiment.