Determination of |Vcb| using the semileptonic decay \bar{B}^0 --> D^{*+}e^-\barν

Details Determination of |Vcb| using the semileptonic decay \bar{B}^0 --> D^{*+}e^-\barν Determination of |Vcb| using the semileptonic decay \bar{B}^0 --> D^{*+}e^-\barν

2001-11-19

arxiv.org/abs/hep-ex/0111060v3

Phys.Lett.B526:247-257,2002

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 6 figures, elsart.cls, submitted to PLB

Scientific paper

10.1016/S0370-2693(01)01476-9

We present a measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb| using a 10.2 fb^{-1} data sample recorded at the \Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e^+e^- storage ring. By extrapolating the differential decay width of the \bar{B}^0 --> D^{*+}e^-\bar{\nu} decay to the kinematic limit at which the D^{*+} is at rest with respect to the \bar{B}^0, we extract the product of |Vcb| with the normalization of the decay form factor F(1), |Vcb |F(1)= (3.54+/-0.19+/-0.18)x10^{-2}, where the first error is statistical and the second is systematic. A value of |Vcb| = (3.88+/-0.21+/-0.20+/-0.19)x10^{-2} is obtained using a theoretical calculation of F(1), where the third error is due to the theoretical uncertainty in the value of F(1). The branching fraction B(\bar{B}^0 --> D^{*+}e^-\bar{\nu}) is measured to be (4.59+/-0.23+/-0.40)x10^{-2}.

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