Non-factorizable contribution to
Department of Physics, Yantai University, 264005, Yantai, China
2 CCAST (World Laboratory), P.O. Box 8730, 100080, Beijing, China
* e-mail: email@example.com
For charmed color-suppressed decay, non-factorizable contributions are expected to be leading, and the naive factorization description breaks down. We study the 1/m b power-suppressed non-factorizable effect in , which is due to soft exchange between the emitted heavy-light quark pair and the system, in the framework of QCD light-cone sum rules. The resulting correction to the decay amplitude is found to be numerically comparable with the corresponding factorizable piece, estimated to be at about (50- of the latter. The relevant parameter a 2 receives a positive number contribution, due to the factorizable correction and the power-suppressed soft effect. Our findings could be crucial to a phenomenological understanding of the decay.
© Springer-Verlag, 2004