YEE HSIUNGWEI-SHU HOUUchida, Y.Y.Uchida2011-07-202018-06-282011-07-202018-06-28200815507998http://ntur.lib.ntu.edu.tw//handle/246246/236181https://www.scopus.com/inward/record.uri?eid=2-s2.0-41149102991&doi=10.1103%2fPhysRevD.77.051101&partnerID=40&md5=683ffdcc813f32151f8376b48fea0027We search for the doubly charmed baryonic decay B̄0→Λ c+Λ̄c-, in a data sample of 520×106 BB̄ 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(B̄0→Λc+Λ̄c-)<6.2×10-5 at 90% confidence level. The result is significantly below a naive extrapolation from B(B-→Ξc0Λ̄c-) assuming a simple Cabibbo-suppression factor of |Vcd/Vcs|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. © 2008 The American Physical Society.en-US10.1103/PhysRevD.77.0511012-s2.0-41149102991WOS:000254544200001https://www.scopus.com/inward/record.uri?eid=2-s2.0-41149102991&doi=10.1103%2fPhysRevD.77.051101&partnerID=40&md5=683ffdcc813f32151f8376b48fea0027http://ntur.lib.ntu.edu.tw/bitstream/246246/236181/-1/25.pdf