L3 (the best LEP result)
B_tn < 5.7x10-4
B_tn
Predict: (4.08 ± 0.24) x 10-4 x |Vub/Vtd|2 ~ few x 10-5 (Use DmB to eliminate fB)
CLEO
At the U(4S) one can suppress background by reconstructing the other B.
B_tn < 8.4x10-4 B_K±nn < 2.4x10-4
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