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• W2914894110 abstract "We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| and of the parameters ρ2, R1(1), and R2(1), which fully characterize the form factors for the B0→D*−ℓ+νℓ decay in the framework of heavy-quark effective field theory. The results, based on a selected sample of about 52 800 B0→D*−ℓ+νℓ decays, recorded by the BABAR detector, are ρ2=1.157±0.094±0.027, R1(1)=1.327±0.131±0.043, R2(1)=0.859±0.077±0.021, and F(1)|Vcb|=(34.7±0.4±1.0)×10−3. The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BABAR measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, ρ2=1.191±0.048±0.028, R1(1)=1.429±0.061±0.044, R2(1)=0.827±0.038±0.022, and F(1)|Vcb|=(34.4±0.3±1.1)×10−3. Using lattice calculations for the axial form factor F(1), we extract |Vcb|=(37.4±0.3±1.2±1.41.2)×10−3, where the third error is due to the uncertainty in F(1). We also present a measurement of the exclusive branching fraction, B=(4.69±0.04±0.34)%.Received 30 May 2007DOI:https://doi.org/10.1103/PhysRevD.77.032002©2008 American Physical Society" @default.
• W2914894110 created "2019-02-21" @default.
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