Measurement of the form factors of the decay B⁰ -> D^*- l⁺ nu_l and determination of the CKM matrix element |V_cb|

2008/10/09 by I. Adachi, The Belle Collaboration, Adachi, I.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.0810.1657

18 pages, 7 figures

arxiv created 2008/10/09 · arxiv updated 2009/12/01

Abstract

This paper describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element |V_cb| using the decay B⁰→ D^*-ℓ⁺ν_ℓ. We perform a combined measurement of this quantity and of the form factors ρ², R₁(1), and R₂(1) which fully characterize this decay in the framework of heavy-quark effective theory, based on 140 fb^-1 of Belle data collected near the Υ(4S) resonance. The results, based on about 69,000 reconstructed B⁰→ D^*-ℓ⁺ν_ℓ decays, are ρ²=1.293± 0.045± 0.029, R₁(1)=1.495± 0.050± 0.062, R₂(1)=0.844± 0.034± 0.019 and F(1)|V_cb|=34.4± 0.2± 1.0. The B⁰→ D^*-ℓ⁺ν_ℓ branching fraction is found to be (4.42± 0.03± 0.25)%. For all these numbers, the first error is the statistical and the second is the systematic uncertainty. All results are preliminary.

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