Measurement of the form factors of the decay B⁺→ D^*0ℓ⁺ν_ℓ and determination of the CKM matrix element |V_cb|

2009/10/19 by The Belle Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.0910.3534

22 pages, 8 figures

arxiv created 2009/10/19 · openalex publication_date 2009/10/19 · arxiv updated 2012/08/27 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28

Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V_cb| times the form factor normalization F(1) using the decay B⁺→ D^*0ℓ⁺ν_ℓ. This measurement is performed together with a determination of the form factor parameters ρ², R₁(1) and R₂(1) which fully characterize this decay in the framework of Heavy Quark Effective Theory. This analysis is based on a data sample equivalent to 140 fb^-1 of Belle data collected near the Υ(4S) resonance. The preliminary results, based on about 27,000 reconstructed B⁺→ D^*0ℓ⁺ν_ℓ decays, are ρ²=1.376± 0.074± 0.056, R₁(1)=1.620± 0.091± 0.092, R₂(1)=0.805± 0.064± 0.036 and F(1)|V_cb|=35.0± 0.4± 2.2. We find the B⁺→ D^*0ℓ⁺ν_ℓ branching fraction to be (4.84± 0.04± 0.56)%. For all numbers quoted here, the first error is the statistical and the second is the systematic uncertainty. A direct, model-independent determination of the form factor shapes has also been carried out and shows good agreement with the HQET based form factor parametrization by Caprini \it et al..

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