Anticharmed pentaquark from B decays

We explore the possibility of observing the anticharmed pentaquark state from the Θcn̄π+ decay of B mesons produced in B-factory experiments. We first show that the observed branching ratio of the B+ to Λc-pπ+, as well as its open histograms, can be remarkably well explained by assuming that the decay proceeds first through the π+D̄0 (or D̄*0) decay, and then through the subsequent decay of the virtual D̄0 or D̄*0 mesons to Λc-p. We then note that the Θc can be similarly produced when the virtual D̄0 or D̄*0 decay into an antinucleon and a Θc. Combining the present theoretical estimates for the ratio gDNΛc/gDNΘc∼13 and gD*NΘc∼13gDNΘc, we find that the anticharmed pentaquark Θc, which was predicted to be bound by several model calculations, can be produced via B+→Θcn̄π+, and be observed from the B-factory experiments through the weak decay of Θc→pK+π-π-.