October, 2001
نویسنده
چکیده
We study the two-body and three-body charmful baryonic B decays: B 0 → Λc p̄ and B → Λc p̄ π(ρ). The factorizable W -exchange contribution to B 0 → Λc p̄ is negligible. Applying the bag model to evaluate the baryon-to-baryon weak transition matrix element, we find B(B → Λc p̄) <∼ 2.5 × 10−5|gB0pΣ+b /8| 2 with gB0pΣ+ b being a strong coupling for the decay Σb → B 0 p and hence the predicted branching ratio is well below the current experimental limit. The factorizable contributions to B → Λc p̄π can account for the observed branching ratio of order 6×10−4. The branching ratio of order 2× 10−3 for B → Λc p̄ρ is larger than that of B → Λc p̄π by a factor of about 3.5 . We explain why the three-body charmful baryonic B decay has a larger rate than the two-body one, contrary to the case of mesonic B decays.
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