The ratio of charged and neutral B meson production at the Υ(4S), f +− /f 00 , is measured through the decaysB → D * ℓ −ν ℓ , reconstructed using a partial reconstruction method where the D * is detected only through a pion daughter from the decay D * → Dπ. 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,is equal to the lifetime ratioand using the world average value of τ + τ 0 as input, we obtain f +− /f 00 = 1.058±0.084±0.136.
From electron-positron collision data collected with the CLEO detector operating at Cornell Electron Storage Ring near sqrt[s]=10.6 GeV, improved measurements of the branching fractions for tau decays into three explicitly identified hadrons and a neutrino are presented as B(tau(-)-->pi(-)pi(+)pi(-)nu(tau))=(9.13+/-0.05+/-0.46)%, B(tau(-)-->K-pi(+)pi(-)nu(tau))=(3.84+/-0.14+/-0.38) x 10(-3), B(tau(-)-->K-K+pi(-)nu(tau))=(1.55+/-0.06+/-0.09) x 10(-3), and B(tau(-)-->K-K+K-nu(tau))<3.7 x 10(-5) at 90% C.L., where the uncertainties are statistical and systematic, respectively.
Using data collected by the CLEO detector in the Υ(4S) region, we report new measurements of the exclusive decays of B mesons into final states of the type Λ + c pn(π), where n = 0, 1, 2, 3. We find signals in modes with one, two and three pions and an upper limit for the two body decay Λ + c p. We also make the first measurements of exclusive decays of B mesons to Σ c pn(π), where n = 0, 1, 2. We find signals in modes with one and two pions and an upper limit for the two body decay Σ c p. Measurements of these modes shed light on the mechanisms involved in B decays to baryons.
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