OBSERVATION OF B MESON DECAY INTO J / psi
1985
Abstract Using the ARGUS detector at the e + e − storage ring DORIS II, we have observed the colour suppressed decay B → J ψ X , with a branching ratio of (1.37 +0.6 −0.5 )% for the mixture of charged and neutral B's produced on the ϒ (4S). From the momentum distribution of the J ψ we conclude that Br ( B → J ψ X ) CL ) , for recoil masses, m x , less than 1 GeV/ c 2 .
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