Determination of the B -> D^*+l-nu Decay Width and |V_cb|

2000/07/25 by CLEO collaboration, CLEO 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.hep-ex/0007052

Contribution to XXXth International Conference on High Energy Physics, July 2000, Osaka, Japan

openalex publication_date 2000/07/25 · arxiv created 2000/07/27 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We determine the CKM matrix element |Vcb| using a sample of 3.33 million BBbar events in the CLEO detector at CESR. We determine the yield of reconstructed B --> D*+ l nu decays as a function of w = v_B . v_D*, and from this we obtain the differential decay rate dΓ/dw. By extrapolating the differential decay rate to w=1, the kinematic point at which the D* is at rest relative to the B, we extract the product |Vcb| F(1), where F(1) is the form factor at w=1 and is predicted accurately by theory. We find |Vcb| F(1) = 0.0424 +- 0.0018(stat.) +- 0.0019(syst.). We also integrate the differential decay rate over w to obtain B(B --> D*+ l nu) = (5.66 +- 0.29 +- 0.33)%. All results are preliminary.

Related

• Determination of the Form Factors for the Decay B0 --> D*-l+nu_l and of the CKM Matrix Element |Vcb|
• Measurement of the form factors of the decay B⁰ -> D^*- l⁺ nu_l and determination of the CKM matrix element |V_cb|
• Measurement of |Vcb| using B0 -> D* l nu_l Decays
• Measurement of |V_cb| and the form-factor slope for Bbar -> D l^- nubar_l decays on the recoil of fully reconstructed B mesons
• Precise determination of the CKM matrix element | V_cb| with B⁰ → D^{* +} ℓ^- ν_ℓ decays with hadronic tagging at Belle