2000/03/10 by The OPAL collaboration, G. Abbiendi, K. Ackerstaff +98
Chemistry · Physics and Astronomy · #Analytical Chemistry (journal) #Branching fraction #Chemistry #Heavy quark effective theory #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Recoil #hep-ex
paper · pdf · doi:10.1016/s0370-2693(00)00457-3
published as Phys.Lett.B482:15-30,2000 · 19 pages, 4 figures, Submitted to Phys. Letts. B
arxiv created 2000/03/10 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2017/04/07 · openalex updated_date 2026/08/05
The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were reconstructed both in the particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu transition at zero recoil F(1) was measured to be F(1)|Vcb| = (37.1+-1.0+-2.0)x10-3, where the uncertainties are statistical and systematic respectively. By using Heavy Quark Effective Theory calculations for F(1), a value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10-3 was obtained, where the third error is due to theoretical uncertainties in the value of F(1). The branching ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.