KEK Preprint 2002-81
نویسندگان
چکیده
We present a measurement of the electron spectrum from inclusive semileptonic B decay, using 5.1 fb−1 of Υ(4S) data collected with the Belle detector. A high-momentum lepton tag was used to separate the semileptonic B decay electrons from secondary decay electrons. We obtained the branching fraction, B(B → Xe+ν) = (10.90 ± 0.12 ± 0.49)%, with minimal model dependence. From this measurement, we derive a value for the Cabibbo-KobayashiMaskawa matrix element |Vcb| = 0.0408 ± 0.0010(exp) ± 0.0025(th).
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