Measurement of the Ratio of Branching Fractions of the Upsilon(4S) to Charged and Neutral B Mesons
S. B. Athar, CLEO Collaboration
Abstract
The ratio of charged and neutral B meson production at the Upsilon(4S), f+-/f00, is measured through the decays B bar -> D* l- nul bar, reconstructed using a partial reconstruction method where the D* is detected only through a pion daughter from the decay D* -> D pi. Using data collected by the CLEO II detector, the charged and neutral B decays are measured in such a way that their ratio is independent of decay model, limited mainly by the uncertainty in the relative efficiency for detecting neutral and charged pions. This measurement yields the ratio of production fractions times the ratio of semileptonic branching fractions, f+-b+/f00b0. Assuming that b+/b0 is equal to the lifetime ratio tau+/tau0 and using the world average value of tau+/tau0 as input, we obtain f+-/f00=1.058+- 0.084+- 0.136.
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