Diquark-Antidiquark with open charm in QCD sum rules

M. Nielsen; R. D. Matheus; F. S. Navarra; M. E. Bracco; A. Lozea

doi:10.1016/j.nuclphysbps.2006.08.045

paper

Diquark-Antidiquark with open charm in QCD sum rules

arXiv:hep-ph/0509131 · doi:10.1016/j.nuclphysbps.2006.08.045

Abstract

Using the QCD sum rule approach we investigate the possible four-quark structure of the recently observed charmed scalar mesons $D_{0}^{0} (2308)$ (BELLE) and $D_{0}^{0, +} (2405)$ (FOCUS) and also of the very narrow $D_{s J}^{+} (2317)$ , firstly observed by BABAR. We use diquak-antidiquark currents and work to the order of $m_{s}$ in full QCD, without relying on $1/ m_{c}$ expansion. Our results indicate that a four-quark structure is acceptable for the resonances observed by BELLE and BABAR: $D_{0}^{0} (2308)$ and $D_{s J}^{+} (2317)$ respectively, but not for the resonances observed by FOCUS: $D_{0}^{0, +} (2405)$ .

6 pages, 5 eps figures; Contribution to the 'Workshop on Light-Cone QCD and Nonperturbative Hadron Physics 2005 (LC2005)', Cairns-Australia