Observation of B → ψπ decays

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    • Abstract:
      We have found the first evidence for the Cabibbo suppressed, color suppressed decay B → ψπ in a data sample of 4 million B decays obtained by the CLEO detector at the Cornell Electron Storage Ring (CESR). The branching ratio is found to be (4.3±2.3)% of the Cabibbo allowed B → ψ K decay mode, which is consistent with theoretical expectations.