The precise determination of the CKM matrix element |Vcb| is important for carrying out tests of the flavour sector of the Standard Model. In this article we present a preliminary analysis of the B¯ 0 → D∗+ `− ν¯` decay mode and its isospin conjugate, selected in events that contain a fully reconstructed B-meson, using 772 million e+ e− → Υ(4S) → BB¯ events recorded by the Belle detector at KEKB. Unfolded differential decay rates of four kinematic variables fully describing the B¯ 0 → D∗+ `− ν¯` decay in the B-meson rest frame are presented. We measure the total branching fraction B(B¯ 0 → D∗+ `− ν¯`) = (4.95 ± 0.11 ± 0.22) × 10−2, where the errors are statistical and systematic respectively. The value of |Vcb| is determined to be (37.4 ± 1.3) × 10−3. Both results are in good agreement with current world averages.
|Publication status||Published - Feb 6 2017|
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