ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 71, p. 1-6
Search for B0→J/ψD̄0 and B+→J/ψD̄0π+ decays
We report the results of a search for the decay modes B0→J/ ψD̄0 and B+→J/ψD̄0π+. The analysis is based on 140fb-1 of data accumulated by the Belle detector at the KEKB asymmetric-energy e+e- collider. No significant signals are observed and we determine the branching fraction upper limits B(B0→J/ψD̄0)<2.0×10-5 and B(B+→J/ψD̄0π+)<2.5×10-5 at 90% confidence level. These results rule out the explanation of the excess in the low momentum region of the inclusive J/ψ spectrum as intrinsic charm content in the B meson. The branching fractions of the corresponding nonresonant decay channels are also reported. © 2005 The American Physical Society.