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The authors present model-independent measurements of the branching fractions[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -]) and[Beta](D[sub s][sup+][yields][phi][pi][sup+]) based on 19.3 fb[sup -1] of data collected by the BABAR detector at the PEP-II e[sup+]e[sup -] B Factory. Neutral B-meson decays to the D*[sub s][sup+]D*[sup -] final state are selected with a partial reconstruction of the D*[sub s][sup+]; that is, only the D*[sup -] and the soft photon from the decay D*[sub s][sup+][yields] D[sub s][sup+][gamma] are reconstructed. The branching fraction[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -]) is extracted from these event yields, while[Beta](D[sub s][sup+][yields][phi][pi][sup+]) is determined by combining this result with a previous measurement of the product[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -]) x[Beta](D[sub s][sup+][yields][phi][pi][sup+]) with partial reconstruction of the D*[sup -]. They obtain the following preliminary results:[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -])= (1.50[+-] 0.16[+-] 0.12)%, [Beta](D[sub s][sup+][yields][phi][pi][sup+])= (4.7[+-] 0.6[+-] 0.8)% where the first error is statistical, and the second systematic.
The authors present model-independent measurements of the branching fractions {Beta}(B{sup 0} {yields} D*{sub s}{sup +} D*{sup -}) and {Beta}(D{sub s}{sup +} {yields} {phi}{pi}{sup +}) based on 19.3 fb{sup -1} of data collected by the BABAR detector at the PEP-II e{sup +}e{sup -} B Factory. Neutral B-meson decays to the D*{sub s}{sup +}D*{sup -} final state are selected with a partial reconstruction of the D*{sub s}{sup +}; that is, only the D*{sup -} and the soft photon from the decay D*{sub s}{sup +} {yields} D{sub s}{sup +}{gamma} are reconstructed. The branching fraction {Beta}(B{sup 0} {yields} D*{sub s}{sup +} D*{sup -}) is extracted from these event yields, while {Beta}(D{sub s}{sup +} {yields} {phi}{pi}{sup +}) is determined by combining this result with a previous measurement of the product {Beta}(B{sup 0} {yields} D*{sub s}{sup +} D*{sup -}) x {Beta}(D{sub s}{sup +} {yields} {phi}{pi}{sup +}) with partial reconstruction of the D*{sup -}. They obtain the following preliminary results: {Beta}(B{sup 0} {yields} D*{sub s}{sup +} D*{sup -}) = (1.50 {+-} 0.16 {+-} 0.12)%, {Beta}(D{sub s}{sup +} {yields} {phi}{pi}{sup +}) = (4.7 {+-} 0.6 {+-} 0.8)% where the first error is statistical, and the second systematic.
We have measured the fraction of b{bar b} events in hadronic Z° decays, R{sub b{bar b}}, using the vertex detector system of the Mark 2 detector at the SLC. We tab b{bar b} events by requiring at least three tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find R{sub b{bar b}} = 0.251 {plus minus} 0.049 {plus minus} 0.030, in good agreement with other measurements and the Standard Model prediction. 10 refs., 1 fig., 1 tab.
We report evidence for the b[yields] u transition B[sup 0][yields] D[sub s][sup+][pi][sup -] and the results of a search for B[sup 0][yields] D*[sub s][sup+][pi][sup -] from a sample of 61.6 x 10[sup 6][Upsilon](4S) decays into B meson pairs collected with the BABAR detector at the PEP II asymmetric e[sup+]e[sup -] collider. The observed B[sup 0][yields] D[sub s][sup+][pi][sup -] yield has a probability of 4.4 x 10[sup -4] to be a fluctuation of the background (3.5[sigma]) and we measure the branching fraction[Beta](B[sup 0][yields] D[sub s][sup+][pi][sup -])= (3.1[+-] 1.0(stat.)[+-] 1.0(syst.)) x 10[sup -5]. They also set a limit[Beta](B[sup 0][yields] D*[sub s][sup+][pi][sup -])
We present a measurement of the absolute branching fraction for D[sup 0][yields] K[sup -][pi][sup+] using the reconstruction of the decay chain[bar B][yields] D*[sup+]X[ell][sup -][bar[nu]], D*[sup+][yields] D[sup 0][pi][sup+] where only the lepton and the low-momentum pion from the D*[sup+] are detected. With data collected by the CLEO II detector at the Cornell Electron Storage Ring, we have determined Br(D[sup 0][yields] K[sup -][pi][sup+])=[3.81[+-] 0.15(stat.)[+-] 0.16(syst.)]%.
The branching ratio for the decay mode D[sup +] [yields] [bar K]*[sup 0] [mu][sup +][nu] has been measured with two methods. The first uses D[sup 0] [yields] [bar K] [sup [minus]][mu][sup +][nu] for normalization, and yields the result B(D[sup +] [yields] [bar K]*[sup 0] [mu][sup +][nu] = (3.25 [plus minus] 0.71 [plus minus] 0.75)%. From this method we also obtain the direct measurement [Gamma](D[sup +] [yields][bar K]*[sup 0][mu][sup +] [nu]/[Gamma](D[sup 0] [yields] K[sup [minus]] [mu][sup +] [nu]) = 0.43 [plus minus] 0.09 [plus minus] 0.09. The second method uses the mode D[sup +] [yields] K[sup [minus]][pi][sup +] [pi][sup +] for normalization and yields B(D[sup +] [yields] [bar K]*[sup 0] [mu][sup +][nu]) = 4.18 [plus minus] 0.66 [plus minus]0.96)%. Combining the results of the two methods yields B(D[sup +] [yields] [bar K]*[sup 0][mu][sup +][nu]) = 3.57 [plus minus] 0.96)%.