title: Anticharmed pentaquark from B decays.
abstract: We explore the possibility of observing the anticharmed pentaquark state from the theta(c)npi(+) decay of B mesons produced in B-factory experiments. We first show that the observed branching ratio of the B(+) to lambda(-)(c)p pi(+), as well as its open histograms, can be remarkably well explained by assuming that the decay proceeds first through the pi(+) D(0) (or D(*0)) decay, and then through the subsequent decay of the virtual D(0) or D(*0) mesons to lambda(-)(c)p. We then note that the theta(c)can be similarly produced when the virtual D(0) or D(*0) decay into an antinucleon and a theta(c). Combining the present theoretical estimates for the ratio g(DNlambda(c))/g(DNtheta(c)) approximately 13 and g(D*Ntheta(c)) approximately 1/3g(DNtheta(c)), we find that the anticharmed pentaquark theta(c), which was predicted to be bound by several model calculations, can be produced via B(+)--> theta(c)npi(+), and be observed from the B-factory experiments through the weak decay of theta(c)--> pK(+) pi(-) pi(-).
authors.affiliation: Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea. suhoung@phya.yonsei.ac.kr
authors.forename: Su Houng
authors.initials: SH
authors.lastname: Lee
authors.forename: Youngshin
authors.initials: Y
authors.lastname: Kwon
authors.forename: Youngjoon
authors.initials: Y
authors.lastname: Kwon