DD¯correlations in fusion and cluster models

In the framework of fusion and cluster models we have studied correlation of DD¯ production in hadronic collisions. The major differences in these two models are found to be in the rapidity-gap and $M_{\mathrm{DD}¯}$ distributions. Both these distributions are found to be much narrower in the cluster model than in the fusion model. Comparing these two models with the available data on DD¯ correlation at √s =27 GeV, we find that the predictions of the fusion model are in better agreement with the data than those of the cluster model.