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Search for \bar{B}^0 →Λ_c^+\bar{Λ}_c^- decay at Belle (2008)

Abstract
We search for the doubly charmed baryonic decay \bar{B}^0 →Λ_c^+\bar{Λ}_c^-, in a data sample of 520×106 B\bar{B} events accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We find no significant signal and set an upper limit of B(\bar{B}^0 →Λ_c^+\bar{Λ}_c^-)< 6.2×10^{-5} at 90% confidence level. The result is significantly below a naive extrapolation from B(B^-→ Ξ\begin0\\c\end\bar{Λ}_c^-) assuming a simple Cabibbo-suppression factor of |V_cd/V_cs|^2. The small branching fraction may be attributed to a suppression due to the large momentum of the baryonic decay products, which has been observed in other charmed baryonic two-body B decays.. PHYSICAL REVIEW D. v.77, n.5, 2008, p.051101-1-051101-6

Publication details
Download http://dx.doi.org/10.1103/PhysRevD.77.051101
http://hdl.handle.net/2237/11345
Publisher American Physical Society
Repository AKF OAI-PMH Repository (Japan)
Keywords 000
Type 研究成果-論文以外
Language eng