Abstract
The semileptonic B decay, B-bar /sup 0/..--> pi../sup +/l/sup -/..nu.., is studied in a nonrelativistic picture by treating the pion correctly as a quasi-Nambu-Goldstone boson. The branching ratio is much larger than the value predicted by a two-body bound-state picture for the pion. This decay at the UPSILON(4S) peak in e/sup +/e/sup -/ annihilation will be one of the best suited processes to determine the Kobayashi-Maskawa mixing-matrix element V/sub b//sub u/.
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