Precise determination of the CKM matrix element | V_cb| with B⁰ → D^{* +} ℓ^- ν_ℓ decays with hadronic tagging at Belle

2017/02/06 by The Belle Collaboration, Abdesselam, A., Adachi, I. +459
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1702.01521

Abstract

The precise determination of the CKM matrix element | V_cb| is important for carrying out tests of the flavour sector of the Standard Model. In this article we present a preliminary analysis of the B⁰ → D^{* +} ℓ^- ν_ℓ decay mode and its charge conjugate, selected in events that contain a fully reconstructed B-meson, using 772 million e⁺ e^- → Υ(4S) → B B events recorded by the Belle detector at KEKB. Unfolded differential decay rates of four kinematic variables fully describing the B⁰ → D^{* +} ℓ^- ν_ℓ decay in the B-meson rest frame are presented. We measure the total branching fraction B( B⁰ → D^{* +} ℓ^- ν_ℓ ) = (4.95 ± 0.11 ± 0.22 ) × 10^-2, where the errors are statistical and systematic respectively. The value of |V_cb | is determined to be ( 37.4 ± 1.3 ) × 10^-3. Both results are in good agreement with current world averages.

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