QUASI TWO-BODY DECAYS OF CHARM MESONS

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Abstract
Quasi two-body decays of charm mesons are studied by using a hard-meson approximation in which the amplitude M is given by M≃METC+MS. The surface term MS is given by a sum of all possible pole amplitudes involving contributions of four-quark and hybrid mesons in addition to ground-state mesons. Contributions of multihadron intermediate states are taken in the form of METC. The spectator type of decays can have significant contributions of s-channel poles of four-quark mesons. In the annihilation type of decays, s-channel hybrid-meson poles can play an important role. The mixed type of decays can have all the pole contributions of the ground-state , possible hybrid and four-quark mesons in the s-channel. The estimated branching ratios, and are of ordinary size, in contrast with the factorization which predicts very large rates for these decays. The and decays can be suppressed in consistency with the other decays.

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