B decays as spectroscope for charmed four-quark states

The D-S(2320) state recently observed by BaBar in the D(S)(+)pi(0) channel may be the first of a host of cq (q) over bar(q) over bar four-quark states. We give a phenomenological account of the masses and decay modes. The isosinglet Ds (2320) state is the only narrow one, dominated by the observed isospin violating decay and less than similar to100 keV in width. All other states are expected to decay hadronically. Notable resonances are in doubly charged D(S)(+)pi(+), D+K+, wrong pairing D+K-, and also DS+K-, Deta channels. We propose B decays as searching ground for such 4-quark states, which recoil against (D) over bar (()*()) meson from B decay, or pi(+) (D) over bar, (K) over bar mesons from (B) over bar decay. Exotic qc (c) over bar(q) over bar charmonia could also be produced, and may be behind the slow J/psi bump in inclusive B --> J/psi + X decay. (C) 2003 Published by Elsevier B.V.