Disentangling two- and four-quark state pictures of the charmed scalar mesons

We suggest that the recently observed charmed scalar mesons D-0(0)(2308) (Belle) and D-0(0,+) (2405) (FOCUS) are considered as different resonances. Using the QCD sum rule approach we investigate the possible four-quark structure of these mesons and also of the very narrow D-sJ(+)(2317), firstly observed by BaBar. We use diquark-antidiquark currents and work to the order of m, in full QCD, without relying on 1/1m, expansion. Our results indicate that a four-quark structure is acceptable for the resonances observed by Belle and BaBar: DO(2308) and D-sJ(+) (2317) respectively, but not for the resonances observed by FOCUS: Do (2405). (c) 2005 Elsevier B.V. All rights reserved.