1012.5949 (Qing Xu et al.)

Two-pseudoscalar Exchanges between Heavy Hadrons    [PDF]

Qing Xu, Hongying Jin, T. G. Steele

We calculate the two-pion and two-kaon exchange potentials of $D\bar{D}$ and $D\bar{D}^{*}$ by using Gaussian form factor to regularize loop integrals. Although the magnitude of the two-pseudo-goldstone exchange is small as expected, it is not negligible in dynamics because it modifies the shape of the potential. We find the bound state of $D\bar{D}^{*}$ starts to {appear} at the cut-off $\Lambda=1360MeV$ after consideration of the two-pseudo-goldstone exchange, significantly reducing the discrepancy between {Chiral Perturbation Theory} and other phenomenological approaches.

View original: http://arxiv.org/abs/1012.5949