Semileptonic Branching Fraction of Charged and Neutral B Mesons
The CLEO collaboration
Abstract
An examination of leptons in Υ(4S) events tagged by reconstructed B decays yields semileptonic branching fractions of b-=(10.1 1.8 1.4)\% for charged and b0=(10.9 0.7 1.1)\% for neutral B mesons. This is the first measurement for charged B. Assuming equality of the charged and neutral semileptonic widths, the ratio b-/b0=0.93 0.18 0.12 is equivalent to the ratio of lifetimes. A postscript version is available through World-Wide-Web in http://w4.lns.cornell.edu/public/CLNS/1994
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