QCD sum rule approach to the new mesons and the gDsJ DK coupling constant

Abstract

We use diquark-antidiquark currents to investigate the masses and partial decay widths of the recently observed mesons D + sJ (2317), D * 0 0 (2308) and X(3872), considered as four-quark states, in a QCD sum rule approach. In particular we investigate the coupling constant g D sJ DK . We found that the g D sJ DK obtained in this four-quark scenario is smaller than the coupling constant obtained when D + sJ (2317) is considered as a conventional cs state.Keywords: