πJ/ψ − DD̅* potential described by the quark exchange diagram

Exotic hadrons reported in the heavy flavor sector have attracted much interest in hadron and nuclear physics. Especially near the thresholds, the hadron-hadron interaction is important to understand these exotic structures. In this talk, the short range πJ/ψ − DD̅* potential whose importance is indicated by the Lattice QCD is studied by the D(*) meson exchange model, and the Born-order quark exchange model. We find the large difference between the results of the D(*) meson exchange and the quark exchange calculations.

Triangular exchange diagram within the full off-shell Coulomb T-matrix in deuteron induced reactions

<span>The amplitude of the triangular diagrams in the three-body models of deuteron induced reactions <span>with charged particles contains the off-shell two-body <span><em>T</em><span>-matrix describing the intermediate-state <span>Coulomb scattering of charged subsystems. Up to now the latter has usually been replaced by the <span>Coulomb potential due to the computational reason. In this paper, we first investigate theoretically <span>and numerically the validity of the mentioned Coulomb-Born approximation. The results show the <span>important contribution of the higher order of the latter approximation for the (d,p) reactions off <span>heavy target.</span></span></span></span></span></span><br /><br class="Apple-interchange-newline" /></span></span></span>